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So let's talk logistics on the 7mm Mashburn Super...
Sounds like it will fit my Win M70 magazine just fine, JGS and PTG both have reamer specs on file.
Now what about dies and brass forming again?

Use .300 Win Mag brass, and then what? Run it through a neck bushing die? Then fireform?

Sorry for the dumb questions, never had to deal with this aspect of reloading before.


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Then what do you use for a bullet seating die?


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Why? What would the 7mm Mashburn Super Magnum do that an available 7mm magnum cartridge wouldn't? When looking at the ballistic tables all of the short 7mm magnums and the Remington and Weatherby 7mm magnums duplicate or better it. Other than the slightly longer neck, a dubious benefit, is it worth the hassle? Mashburn formed it out of .300 H&H brass (except the Long version which used full length brass). It would require similar tooling to my .375 Epstein Magnum formed on the .375 H&H, form and trim die, ream die, full length die. Necks should be annealed due to moving so much brass and forming the neck from the parent brass shoulder. I'm sure that forming the cases out of .300 Winchester brass would require similar tooling if the new neck will be moved into the old shoulder.

Now a days I could just buy a .375 Ruger and open a box of ammo or brass.

Is it worth the effort?

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If you wish pm me your phone # and I'll talk you thru it.

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It's a snap...run a 300 Win Mag case through the form die, then the trim die...next FL die and charge your FF load if you want to do it that way.

I hear some others simply run 300 win mag brass through a Mashburn F die, and let it go at that...I'm going to try that as well.

BTW the FF load is as fast at milder pressures than what 280AI's strain at the gills to get.Perfectly useable for hunting at that stage.The load Dober gave me does 3190 with the 139 Hornady. That works...

OR, you can charge the case with 13 gr Bullseye,dry tumbling media,large pistol primer,and have nice new, perfectly formed Mashburn cases.

Why do it? well you don't have to...but it is not true the 7RM is as fast...it is not, unless you really lean on it....the case holds more powder than either the 7mm Weatherby or the 7RM, not as much as an STW.

It gives 3200-3250 with a 160;3050-3075 with a 175 easily from a 24" barrel.The smaller 7's are not as fast IME, not at pressure I'll live with day to day.

I have not encountered any ofthe problems Wrangler John mentions above.

I am not wildcat guru...this thing is stupid simple, maybe superfluous today,but it takes a back seat to no 7 mag on the market today.

Last edited by BobinNH; 07/13/11.



The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Thanks guys. Looks like RCBS makes the form die. What are you using for a seating die? Are you using one specifically made for the Mashburn Super? Could you get away with backing off some sort of commercial 7mm seating die?


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exbio we have two sets....my pal has an RCBS set which includes form, trim,FL and seating. Thisis just like Dober's sent which (bless his little heart grin he loaned me to get started.

I have this set on order from RCBS also.I have not tried this but suspect this set up might have been required when cases were formed from 300H&H cases.

Just the other day, I got my FL and seat die from Redding which I have not used yet.

I hear through the grapevine that a prominent gunmaker who has recently built a Mashburn for a client, has just been running 300 Win Mag cases into the FL Mashburn die,and then fireforming.Again I intend to try this and see how it works.

This die set cost me $175 bucks.

OU76,who posted on here,did the fastest Mashburn conversion I know of....he got the RCBS dies. He had is rifle up and running in no time.

You should follow up with a call to Dober as he will fill you in on any little details. This is not a tough wildcat to form. wink

If I can do it,anyone can. grin

Last edited by BobinNH; 07/13/11.



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Just got off the phone with Dober.... and basically I blame you all you guys for getting me into this. smile

I found a reamer in stock with PTG and that's on the way right now.
Talked to Redding earlier, and they had a full length die set, but it was claimed by another customer. Said they'd call me back if it wasn't actually sold.

Now that, I'm getting myself commited, I still need some sort of dies. I believe, and correct me if I'm wrong here (and it sounds like a call to the 'smith is in order), I can just use that reamer in a $25 die blank to at least build a full length sizer die, and get away with a backed off seater for the time being.

From an earlier post, it sounded like people managed to survive shooting 7mm Rem Mag brass in a Mashburn chamber, but I'm not sold on that idea yet.


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Quote
I believe, and correct me if I'm wrong here (and it sounds like a call to the 'smith is in order), I can just use that reamer in a $25 die blank to at least build a full length sizer die


I'm pretty sure a die reamer will need to be a little smaller in each dimension than the chamber reamer.

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Originally Posted by mathman
Quote
I believe, and correct me if I'm wrong here (and it sounds like a call to the 'smith is in order), I can just use that reamer in a $25 die blank to at least build a full length sizer die


I'm pretty sure a die reamer will need to be a little smaller in each dimension than the chamber reamer.


Correct.


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Originally Posted by exbiologist


From an earlier post, it sounded like people managed to survive shooting 7mm Rem Mag brass in a Mashburn chamber, but I'm not sold on that idea yet.


NO don't do that!Not as far as I know anyway.... crazy Others may know different.....

I know about that die set at Redding...Chuck and Rick (both from Canada), Matt and I started the whole thing at Redding...they used cases from my rifle and Matt's to build those dies....Matt's rifle and mine were cut with Dober's reamer.

As to making the die,I'm sure it can be done...Redding has the blueprint now though...might be easier to go that route.
I guess you could se a 7RM or STW seat die to get by for now but really do not know....never tried it.

Blame Dober;he started it grin....think you will like it...everyone else has so far.




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The 7 Rem Mag is over bore.
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Alright, so here's where I'm at....
Like you guys pointed out, smithy wasn't about to use the chamber reamer to cut a sizer die.

BUT....... there's a guy on gunbroker that is offering a 7mm Mashburn loading service that might be able to get me up and running while I wait for dies. Still gonna need some brass though


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Uhh, so if anyone else wants to get in on this, RCBS has already scheduled a production of 1 set of case forming dies at the end of this month. They said it wouldn't be anything to add another one or two to the production.


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The Rick from Canada here. Just to let you know, I can verify that the customer who has his name on that set of Redding FL dies is taking them. Cuz that customer is me. wink

Payment should be there by now.


Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!

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I always knew you were a smart fella there Rick.. wink

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Originally Posted by exbiologist
Uhh, so if anyone else wants to get in on this, RCBS has already scheduled a production of 1 set of case forming dies at the end of this month. They said it wouldn't be anything to add another one or two to the production.


Exbio thanks...I think my dies are in that run they are gonna do, but I will verify the order was placed tomorrow.


You do good work wink

Blame Dober! grin




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Originally Posted by Mark R Dobrenski
I always knew you were a smart fella there Rick.. wink

Dober


Perhaps. But obviously I take advice from unsavory characters! grin


Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!

Stolen from an erudite CF member.
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Should that be blame or thanks... cool

Just trying to show the world a betta way.

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It would be thanks. wink

Looking forward to seeing a 160 TSX clocking 3250 out of a 24" barrel.


Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!

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Originally Posted by RickF
It would be thanks. wink

Looking forward to seeing a 160 TSX clocking 3250 out of a 24" barrel.


Reettuummbbooooooo

grin




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The 7 Rem Mag is over bore.
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Run a 7 mm ultra and step away from the others.. That's the only 7mm I have interest in.


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Good! You want a 26" tube, 9 pounds of rifle and a hat load of powder,one source of brass, that's your Huckleberry wink

It goes faster for sure smile

Last edited by BobinNH; 07/13/11.



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The 7 Rem Mag is over bore.
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Good to know what you like, now you can step away from this thread on the 7 Mash Super... wink

Dober

Last edited by Mark R Dobrenski; 07/13/11.

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Originally Posted by BobinNH
Originally Posted by exbiologist
Uhh, so if anyone else wants to get in on this, RCBS has already scheduled a production of 1 set of case forming dies at the end of this month. They said it wouldn't be anything to add another one or two to the production.


Exbio thanks...I think my dies are in that run they are gonna do, but I will verify the order was placed tomorrow.


You do good work ;

Blame Dober! grin


You guys suck. Now I'm thinking about M70 donors and pondering ordering case forming dies. Just what I need.... a fifth 7 Mag.






smile


Originally Posted by ingwe
This is a shooting forum, there is no place here for logic.
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KDK: What 5 7 mags do you have now? confused Are they all 7RM?




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Actually, Bob, it's four now... 2x7WSM, 2x7RM. A Mashburn will probably not do anything more than what I have (at least that I can utilize) but I like the idea of doing something a little different than the norm.


Originally Posted by ingwe
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Originally Posted by KDK
.. 2x7WSM, 2x7RM. A Mashburn will probably not do anything more than what I have (at least that I can utilize) but I like the idea of doing something a little different than the norm.


KDK: I can understand that.... smile You're more than suitably armed wink
So the Mashburn is tough to justify.

That said, what drove me to it was many years spent with the 7 RM,which is splendid as is,but when convenient I built them with a long throat and a H&H action,set up to seat heavy bullets "out"...I found this did not give much more velocity(some),but did prevent those funny walls that seemed to pop up as I approached top end.I see this even here with guys running into velocity walls with the cartridge..the cure is generally pretty simple...it's throats and barrels.

I always felt the case body and neck on the 7 RM could have been longer;and since all the rifles I've had for the 7RM had H&H length actions anyway, I might as well use it.

The Mashburn eliminated all these tiny faults (riflemen understand);has a longer neck,more case capacity without going over board,and gets its' velocities,easily, from 24" tubes(it goes even faster, easily, with longer barrels).

What I have found is that it gives that 3050-3075 or so with a 175 gr bullet,and with todays powders,easily hits 3200+ with 160's;even better than Page and Hagel promised, with todays powders.

What Art Mashburn found back in the 50's (there were actually 3 7mm Mashburns),was that going to a bigger case than the Mashburn Super, did not provide significantly more velocity than the Super,and just burned more powder.Hagel discovered this himself working the 7mm-300 Weatherby...maybe not true with todays powders, but a glance at loading manuals for the STW and the RUM points out this is true,especially with 160-175 gr bullets.And avoids the large powder charges and 26" tubes of the larger cases.

Said another way, the Mashburn Super hits a "sweet spot";not too big, not too little,and can be put up in a 24" barrel and under 8 pound rifle,takes reasonable powder charges,and gets velocities close to the larger cases without straining things.

It just works good.While hard for some to justify (understandable),for me it makes just as much sense as a 280 AI,comes in rifles of the same weight and length,and outperforms that cartridge easily.

Whether it is worth it or not is up to everyone to decide for themselves, as with most things shooting related. smile




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The 7 Rem Mag is over bore.
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Plus.....it's got a ton load of panache and the cult is growing.. cool

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Laffin'....geez is it ever!

Not a day goes by I'm not getting emails or PM's of some sort...you, too I know.. shocked

I hear Redding had to hold a special meeting to crank up die production...it was not in the stable until we sent cases for dies....

Last edited by BobinNH; 07/14/11.



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The 7 Rem Mag is over bore.
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who do u think was on the conference call... wink

Dober


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Ha! I did not know......mmmm....somebody didn't gimme all the facts! cool


Investigation is ongoing... grin




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Main problems I see are related to all the steps needed for case forming (annealing, resizing, fire-form w/inert material, etc).. Awful lot of fussy-work to get a few fps more - speed that any animal it's used on will have no clue it's needed..

Just my very humble .02... smile


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My experience has been different from yours with it Redneck. The only diff tween what I do with this case and any others is the intial work with the form die and the trim die. Neither take any lube to do the work. Just set the die, run the case up and down. Next time I do a bag of 50 I'll time it. Not sure exactly how long it'll take me to do the 50 but I spect it's less time than it takes to cook a frozen pizza.

As for fire forming, I do about 100 rounds a year of it, and in all honesty 50 rounds would do me just fine so I think I'm taking an extra 8 or 9 minutes per year to prep the case over others...

I load em, shoot them and move on. My FF load is good to go at my local range to 434 yds (as far as we have to shoot at this range). I've never noticed anything wrong or difficult about it. Just good practice is all I see.

As for what's worth it, well we've only ourselves to please is I think the way that Steely says it. IMO once we get beyond the 223, .270 or 06 and the 375 H&H it's all pretty much for fun and giggles.

I don't see it as any more fussy work than I would say in working with a 264 vs a .270, One would have to wonder if the extra fps one would get is something that most people are ever gonna use or get to take advantage of...

Plus, I can easily find 300 Win brass without ordering it, and something like the 264 will take me more time...grin. So, bottom line is we do what makes us perk is all, no wrong just different I spect.

Just my humble opinion..

Dober


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Dober's right...no lube at all in the form process, until of course you resize fired brass...but not for forming.

Once it's formed,it needs nothing.

Annealing? No more than one would do to any other brass, which for me has been "never"...I don't do it.

Forming is a cake walk; I can run 50 cases through form/trim/FL in about 20 minutes, if that...it's nothing.Boom, boom, boom.

I use both COW and live fire to form brass....using COW I form 75-100 cases in 2-3 hours at the range....it's easy.

For live fire, I use Dobers load,65 IMR4350-139 HDY.I could easily hunt with it.I shoot it routinely out to 600 yards(just last week).At 600 it shoots slightly lower than full house 160's and 175's...no need to touch the sites.

I will COW another 100 rounds...plus maybe 200-300 I have accumulated through live fire....I could hunt the next 10 years with that, if I did not shoot so much. grin

BTW, you are talking to a guy who HATES to reload...I only do it because I have to to afford to shoot...this thing is a cakewalk grin

Last edited by BobinNH; 07/14/11.



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I never said a thing about lube.. I am only going by the notes in Ken Howell's book, which mentions the steps I noted above.. I had to look it up - I've never seen/fired the Mashburn.. It just seemed like a lot of falderal to me.. But then, I don't reload for anything not SAAMI.. I've gotten too old/lazy.. Hehehehee..

But I hear ya re: the 'something different' deal.. laugh laugh


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Probably been discussed extenseviley before but why a Mashburn over a STW. Is it the awesome factor? As in you're at the range, and your neighbor says "what are you shooting there"? and you reply "7mm Mashburn Super", your neighbor then asks "what's a 7mm Mashburn Super"? You then get a serious look on your face look him dead in the eye and say...."awesome". wink

Since I've been recently dissapointed with my 7RM handloads and a lover of the .284 maybe I need to look to a bigger case.

Last edited by jryoung; 07/14/11.

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Originally Posted by jryoung
Probably been discussed extenseviley before but why a Mashburn over a STW. Is it the awesome factor? As in you're at the range, and your neighbor says "what are you shooting there"? and you reply "7mm Mashburn Super", your neighbor then asks "what's a 7mm Mashburn Super"? You then get a serious look on your face look him dead in the eye and say...."awesome". wink

Since I've been recently dissapointed with my 7RM handloads and a lover of the .284 maybe I need to look to a bigger case.


jr:No, it isn't that....anymore than it is with any wildcat..no one really gives a shidt what ya shoot anyway smile

Just like for 280AI shooters,it's a way to get a bit of an edge,velocity wise,without leaning hard on a cartridge.That's all.....anyone at the range asks what I am shooting I just say...."7mm Mag" smile

Your experience with the 7RM (and what you say above about your 7RM),is the reason I tried a couple of larger capacity 7mm's,like the STW and the Dakota.I have seen the velocities like you are getting....but a 140 gr bullet at 3050 is not why I buy a 7mm magnum....I expect that with a 160-175 gr bullet. So, for the same reasons many on here want a 280AI, I wanted something that handled heavy 7mm bullets, faster.

Tried the STW....good choice of course but most of the bluster and thunder comes from 26" of tube,which I don't like or want...I simply did not want an STW......and the Dakota was a very good cartridge with a single source of brass,but I encountered some brass problems with it in the form of splits on the second firing....plus if you hunt with a 7mmDakota, you just might as well have a wildcat, cause you will not find ammo anywhere.

The Mashburn just works the way it was designed,no mysteries, very straight forward, and easy to use and like.I can form it easily with commonly available 300 Win Mag brass....Well balanced, efficient, it gives the velocities that everyone has said it will give... like any tools that we use, you don't want any surprises.

It's my fun rifle,as well as being a good load for the hunting I do.....when I don't feel like playing, I grab a 270 smile




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Being able to say I'm not shooting a 7 Rem Mag is reason enough for me to get a Mashburn Super, were I in need of a magnum 7.

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How about a pic of a 7 mashburn super cartridge?
thanks

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Originally Posted by Mark R Dobrenski
If you wish pm me your phone # and I'll talk you thru it.

Dober


The madness continues laugh

Talking to Dober about the Mashburn is like talking to the Apostle Paul about Christ... you'll likely come away converted grin


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I would like to see someone chronograph loads in the same barrel in a long throated 7RM, then the Mashburn and maybe the STW. Put a strain gauge on it and see what happens.

Maybe a bad idea might take the magic out of it. Sort of like reading Capstick's book on Pondoro Taylor it ruined everything.


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In Nosler's reloading guide they list 5 loads that shoot 160 grain bullets at 3,100 mv from a 24" barrel from a 7mm WBY.

Two of those loads nearly reaching 3,200.



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Nosler also says 140 accubonds will run 3300 with a 7RM. I don't shoot noslers but i'm guessing those are generous velocities given my recent testing.

I should stop reading this thread, I reallly want a hotter 7 and Bob is a good friggen salesman.


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Originally Posted by SU35
In Nosler's reloading guide they list 5 loads that shoot 160 grain bullets at 3,100 mv from a 24" barrel from a 7mm WBY.

Two of those loads nearly reaching 3,200.




I wanted a 7mm Mag and thought hard about the Mashburn because of the negative press about pressure problems with the Remington Mag, but ended up with a good deal on a 7mm Weatherby instead. It gets very close to some of the numbers quoted by Bob for the Mashburn. Federal factory loads with 160 Trophy Bonded Tipped are cruising at a little over 3200 and shoot into 3/4". That load may be hard to top with handloading or even wildcatting.

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Originally Posted by exbiologist
Then what do you use for a bullet seating die?


Bullet seating dies are pretty generic. The length of stroke in your press would beg the bigger question.


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Originally Posted by BobinNH
This die set cost me $175 bucks. grin



Doesn't this: $175
And this: 175 bucks

....mean the same thing? cool

Sorry, couldn't resist.


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Originally Posted by jryoung


Since I've been recently dissapointed with my 7RM handloads and a lover of the .284 maybe I need to look to a bigger case.


Came to the same conclusion. I stepped up to the 300 WSM and gave up all the twitterpatin' over the .284 minutia of this-is-better-than-that. I did retain my 280's in their original form.


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Originally Posted by DesertMuleDeer


I wanted a 7mm Mag......but ended up with a good deal on a 7mm Weatherby instead. Federal factory loads with 160 Trophy Bonded Tipped are cruising at a little over 3200 and shoot into 3/4". That load may be hard to top with handloading or even wildcatting.


I could not get my 160's to go above 3187 fps no matter what I tried in all three of my 7 Wby's. I wanted 3200+ with handloads. Couldn't get there.

Now I shoot a 300 WSM with 150 AB's cruising at 3285 fps average and not straining anything. I like it much gooder.


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Reloader I consistantly get 3269 fps. over a Shooting Chrony using 76 gr. RL-25 and a 162 gr. Hornady from a 24" barrel out of my Mashburn. My case capacity is 90 gr. water or about 4 gr. over the 7 Weatherby. I only shoot 160 gr. +/- out of this gun and accuracy is consistantly .6" +/-. I am building another on a Rem 700 and will set it up for 175's; Sierra or Nosler. I intend to use Retumbo or H1000 if the gun will shoot that powder well and be done with it.

At 3269 I can reload the brass about 8-10 times before it work hardens in the neck to where I need to anneal it and instead I chunk it.

To me the Mashburh is effective, reasonably barreled (24"), light 8 lbs. +/-, and plenty powerful. What is not to like?

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Originally Posted by Reloder28


I could not get my 160's to go above 3187 fps no matter what I tried in all three of my 7 Wby's. I wanted 3200+ with handloads. Couldn't get there.

Now I shoot a 300 WSM with 150 AB's cruising at 3285 fps average and not straining anything. I like it much gooder.


Let me get this straight.
You're disappointed when you can't reach 3200 with a heavy for caliber bullet in the 7 Wby but you're perfectly thrilled with a light for caliber bullet reaching 3285 even with the radically lower SD and BC of the 150gr.
Bet you can't push a 180gr 30 caliber bullet to 3200 with the 300WSM. And you still don't have the SD of the 160 7mm.
Did you consider a 140gr bullet in your 7 Wby?


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Anybody got a pic of a 7mm mashburn super?

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Here's a link to a visual comparison of the Mashburn to the 7 RM, and the 7 Wby.

7mm Mashburn comparo

Don't know how to post it directly here hence the link.


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Originally Posted by 257WBYLOVER
Anybody got a pic of a 7mm mashburn super?


The search feature (and BobinNH) is your friend.

http://www.24hourcampfire.com/ubbthreads/ubbthreads.php/topics/4460772/3


Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!

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Originally Posted by nsaqam
Let me get this straight......you're perfectly thrilled with a light for caliber bullet reaching 3285 even with the radically lower SD and BC of the 150gr.
Did you consider a 140gr bullet in your 7 Wby?


I briefly ran 140's, even took an elk with one, but I much prefer 150's in the 7mm & 308 calibers. My longest ever witnessed kill was 389 yards on a running pig. That shot was with a box stock 280 Rem with 150 CoreLokt commercial ammo. I am not interested in flight path characteristics as concerns sd's or bc's when it comes to hunting bullets. I just wanna hunt and am perfectly happy doing so with my current load in the 300 WSM. I have no concerns at all that it will take me out to 500 yards should I desire to do so.

My current self imposed distance of engagement is no more than 300 yds until I get a good turret scope.




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So, do you 7 MSM proponents think it'll fit in my 7 Wby Mk V action?


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Of course it will.


Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!

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Talking to Snowflake, another 7mm MSM user, and he pointed me toward an article on the 7mm Practical, which is essentially the same thing. So help me interpret what I'm reading here...
http://www.ballisticstudies.com/Resources/Articles/The+7mm+Practical.++A+Practical+Magnum..html

If I'm reading this right, he formed the cases using a generic Hornady 7mm neck sizer with a 30 degree shoulder.
Then he used a 7mm Rem Mag seating die.
This is what I've been trying to figure out if I could do in order to make my rifle operational this year, not this coming winter.

Tell me if I'm way off base here thinking I could pull something like this off.


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And continuing this train of thought, guess which commercial 7mms have a 30 degree neck?





The RUM and RSAUM!

So, dare I go ahead and put my reamer to work now that I won't be crippled by $300 worth of form and sizing dies plus a 4 month lag?

Last edited by exbiologist; 07/16/11.

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Originally Posted by 257WBYLOVER
Anybody got a pic of a 7mm mashburn super?



257 can't recall if I ever posted one....Mmmm.....did Dober?




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Originally Posted by Brad
Originally Posted by Mark R Dobrenski
If you wish pm me your phone # and I'll talk you thru it.

Dober


The madness continues laugh

Talking to Dober about the Mashburn is like talking to the Apostle Paul about Christ... you'll likely come away converted grin


Brad, Dober is the cult leader, no question.... grin





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The 7 Rem Mag is over bore.
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U sent one to Skane and he posted it for you

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[Linked Image]

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Oh yeah!!! There it is! Thanks Dober!

I'd a never found it! grin

RD thanks to you, too! wink

Last edited by BobinNH; 07/16/11.



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The 7 Rem Mag is over bore.
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Originally Posted by RDFinn
[Linked Image]


Left to right:

1)7 Rem Mag case .....

2)300 Win Mag after a pass through Mashburn form and trim

3)Fully blownout Mashburn case (using COW method)

4)Loaded 7RM

5)Mashburn with 160 Nosler Partition.

Last edited by BobinNH; 07/16/11.



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Originally Posted by exbiologist
Talking to Snowflake, another 7mm MSM user, and he pointed me toward an article on the 7mm Practical, which is essentially the same thing. So help me interpret what I'm reading here...
http://www.ballisticstudies.com/Resources/Articles/The+7mm+Practical.++A+Practical+Magnum..html

If I'm reading this right, he formed the cases using a generic Hornady 7mm neck sizer with a 30 degree shoulder.
Then he used a 7mm Rem Mag seating die.
This is what I've been trying to figure out if I could do in order to make my rifle operational this year, not this coming winter.

Tell me if I'm way off base here thinking I could pull something like this off.


I've read through that before. The 7Practical looks like what we really are looking for since it is so easy to do. Allows the gunsmith to use 7RemMag go-no go gauges when chambering.

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You can do that with the Mashburn too I believe... Any thoughts on just running .300 Win Mag brass through a 7 RUM or 7RSAUM sizer in order to form brass?

Sounds like at least two people are able to form brass by way of running .300 Win Mag brass straight into the 7mm Mashburn dies before fireforming. Gotta be gentle though.


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That is exactly what I plan on doing.


Anybody who seriously concerns themselves with the adequacy of a Big 7mm for anything we hunt here short of brown bear, is a dufus. They are mostly making shidt up. Crunch! Nite-nite!

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Originally Posted by BobinNH
Originally Posted by RDFinn
[Linked Image]


Left to right:

1)7 Rem Mag case .....

2)300 Win Mag after a pass through Mashburn form and trim

3)Fully blownout Mashburn case (using COW method)

4)Loaded 7RM

5)Mashburn with 160 Nosler Partition.
Thanks BOB and RDFin. Makes me wish i had one. I will just have to be happy with my 270-300WBY

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Now looking at these side by side pictures, the question of using the 7 Rem as backup ammo if all is lost in transit is answered. It can be done but is a not good idea except in case of emergency.

At the range one day a fellow had a mid-50's rifle that he had inherited from his Gfather. I asked what it was and he said 7 Magnum. I looked at the brass, he was shooting 7 Rem in a Mashburn chamber. I asked why and he said he could buy the shells locally and they worked. Accuracy wasn't stellar but in a pinch in the way backs with lost ammo/luggage.

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This is from Nathan Foster, the 7mm Practical guy when I asked him about using a RUM or RSAUM die to form cases:

Hi Mark, yes, you can use the 7mm Rum die but you will have to cut it back with a grinder and cut off disc (have done this before). The RSAUM die will work as well providing you have a long stroke press. If you want a generic neck die, the hornady �7mm Magnum Neck� is the correct die.

Before you go too far, check the body diameter of your reamer to make sure that you can use neck sized .300 Win Mag brass. If the body diameter of the Mashburn reamer is smaller than factory .300 Win mag brass, you will need to contact Hornady and have them make you a full length resizing die, they will also need the reamer measurements. Lonnie Hummel is the man to speak to, he is very good, makes excellent custom dies. It took me quite a while to obtain the ideal reamer body diameter for the Practical so that it would easily (and continually) utilize neck sized brass. If you find that the Mashburn reamer is going to be difficult to utilize, the 7mm Practical reamer can be obtained from PTG and is pretty inexpensive.

If you get stuck or are confused about any of the above, please get back in touch.

Cheers, Nathan.


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Mark and Bob could sell ice cream to Eskimos. grin

I really do like the Mashburn concept...

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Yeah I think you are right, my brother has this old pushfeed Winchester 7mm Rem. Mag that he isn't using........nah I better not.


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I've got a reamer....... smile


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Originally Posted by exbiologist
I've got a reamer....... smile


For what? I am confused.... grin






The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Little thing called a Mashburn, you may have heard of it. Not sure what I'm gonna do with it.


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Oh...OK...I thought you were leaning to the Practical, which was why I asked... smile




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Originally Posted by Oldelkhunter
Mark and Bob could sell ice cream to Eskimos. grin



Oldelkhunter: I just report results.... smile

Everyone is free to draw their own conclusions. wink




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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At this point I really don't know where I'm leaning. May decide to can the supercharging for now and just go with the 7 Rem Mag as is, all these extra costs I'm looking at are eating into my hunting budget, and I've got a lot of hunts planned this year: numerous deer, elk and antelope hunts, plus a bear. Just not sure I want to spend more money reaming, tweaking the magazine and bolt stop (not necessary) and dropping major coinage on dies plus leaving the gun out of commission for a few months. Need conserve the gas money, and Wednesday is leftover tag day for Wyoming, plus I need to plunk down some horse rental fees now that my buddy with the horses has backed out of the backcountry hunt.

Things are adding up fast, might have to call her good as is. And I'm already sporting a 26" barrel, which should be good for over 2900 fps on those 175s.

Stuck in indecision mode right now.


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These odd ball cartridges are fun to play with when one has the time and money. In a practical sense they offer nothing but the fun of saying and thinking you have something that maybe Page or Hagel mentioned.

Just shoot a regular 7mm RM or if more is wanted the 7mm STW and RUM are right here for you.


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Originally Posted by exbiologist
I've got a reamer....... smile


I hear ya exbiologist, I have considered it. Got a couple of things to do first like add a pre-64 to my lineup. wink


JOC was right. The 270 Winchester on a Model 70 is a great combination as is the 30/06 and 375 H&H

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exbio: If you are not sure you want one, you should not build it.Use the money to hunt instead; the 7 Rem Mag is just fine.

Personally I don't build rifles to engage in fantasies;I build them to shoot and hunt with. So I don't keep lots of excess "stuff" around.It either hunts and performs,or it hits the road after I play with it.

Owning this rifle is no more impractical, and far less expensive, than having safes full of rifles that never see the light of day and never travel anywhere to hunt.Lots of people have opinions about stuff they have never done....owning a wildcat is no different.

I built mine to hunt...I have had many other 7mm's...standard and magnum.This one does what I want.

If you are running into too many obstacles in your mind about it, then you don't really want it, and should not build it.It's that simple.

Last edited by BobinNH; 07/19/11.



The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Just don't forget your ammo <g>!


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I bring plenty... smile

And a spare rifle.too.




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Originally Posted by Oldelkhunter
Mark and Bob could sell ice cream to Eskimos. grin

I really do like the Mashburn concept...


The Mashburn sells itself. They just jumped on the bandwagon grin...like I'm gonna do too.


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Originally Posted by Reloder28
Originally Posted by Oldelkhunter
Mark and Bob could sell ice cream to Eskimos. grin

I really do like the Mashburn concept...


The Mashburn sells itself. They just jumped on the bandwagon grin...like I'm gonna do too.


The more I read about it the more it seems like the perfect 7 mag.

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Originally Posted by Oldelkhunter
Originally Posted by Reloder28
Originally Posted by Oldelkhunter
Mark and Bob could sell ice cream to Eskimos. grin

I really do like the Mashburn concept...


The Mashburn sells itself. They just jumped on the bandwagon grin...like I'm gonna do too.


The more I read about it the more it seems like the perfect 7 mag.


I doubt it is perfect, smile but in a very imperfect world,it might approach providing about as much bullet weight,horsepower, and flat trajectory as is consistent with a reasonably light,mountain weight,general purpose BG rifle, that will not kick you into next week.

It is really very simple,and the reason I wanted one is that I wanted (1)a 175 gr 7mm bullet @3100 fps (2)from a light contoured 24" barrel (3)in a rifle weighing a bit less than 8 pounds (4)that had manageable recoil.

That it (easily)gives 3200+ fps with 160 gr bullets is kind of a bonus....but in truth I bet the 175 gr can do it all.I hope to find out.

Looks like Reloder wants one too... smile




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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The 7 Mashburn is only for the experienced and dedicated shooter and handloader. If you don't understand and appreciate what it offers and don't know how to make the cases and load for it then you should settle for less. Get ten or more years of experience and then you may understand. Few learn from those with a lot more experience.

Last edited by RinB; 07/19/11.


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I've already drank the Mashburn cool aid! One's going to grace my gun room in the next year...period. Just need to find a 7Mag barreled action. It's no harder to own than an ACKLEY IMPROVED cartridge. powdr

Last edited by powdr; 07/20/11.
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OK so ballistically it is a 7nmm STW?


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Originally Posted by Fotis
OK so ballistically it is a 7nmm STW?


More or less....how an STW does in a 24" tube, I have no idea.In a 26" tube, an STW may be faster.

Overall ,there is overlap, yes.




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Originally Posted by powdr
I've already drank the Mashburn cool aid! One's going to grace my gun room in the next year...period. Just need to find a 7Mag barreled action. It's no harder to own than an ACKLEY IMPROVED cartridge. powdr


I think I am in too, I just need to decide on an action then see if I can find one. I'm leaning M70 stainless (crf), but cost may push me back to a 700.


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Originally Posted by jryoung
Originally Posted by powdr
I've already drank the Mashburn cool aid! One's going to grace my gun room in the next year...period. Just need to find a 7Mag barreled action. It's no harder to own than an ACKLEY IMPROVED cartridge. powdr


I think I am in too, I just need to decide on an action then see if I can find one. I'm leaning M70 stainless (crf), but cost may push me back to a 700.


powdr is right...no big deal to form cases.

jr, a Rem 700 is about as easy as it gets...it will work great wink




The 280 Remington is overbore.

The 7 Rem Mag is over bore.
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Cool old thread. Always learn something new when you go digging around here.


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Originally Posted by BobinNH
exbio: If you are not sure you want one, you should not build it.Use the money to hunt instead; the 7 Rem Mag is just fine.

Personally I don't build rifles to engage in fantasies;I build them to shoot and hunt with. So I don't keep lots of excess "stuff" around.It either hunts and performs,or it hits the road after I play with it.

Owning this rifle is no more impractical, and far less expensive, than having safes full of rifles that never see the light of day and never travel anywhere to hunt.Lots of people have opinions about stuff they have never done....owning a wildcat is no different.

I built mine to hunt...I have had many other 7mm's...standard and magnum.This one does what I want.

If you are running into too many obstacles in your mind about it, then you don't really want it, and should not build it.It's that simple.


this savvy from BobinNH is golden

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Bump.

Just because.


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Originally Posted by nyrifleman
Bump.

Just because.


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