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Campfire Ranger
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Campfire Ranger
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Joined: Jan 2007
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Campfire 'Bwana
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Campfire 'Bwana
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Oh....7mm/300 Win?
I'll still take the Mashburn. Like the longer neck and forming that shoulder is done with a single pass through a die.No more work than the 7mm/300 for me. i really don't mind it. Not an issue.
It's easy.
You are right though...I used to make 7mm/300WM cases with a 7 RM neck die back in the 80's...... I just never wanted one.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Joined: Dec 2007
Posts: 16,132
Campfire Ranger
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Campfire Ranger
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All I did was answer his question......
I went with the 7x300 for the reasons I stated.
We all know about your passion/obsession with the Mashburn.
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Joined: Jul 2003
Posts: 1,161
Campfire Regular
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Curious as to what brand of brass is being used by those not achieving the desired velocities? In my limited experience with the cartridge, I get pressure signs in Norma brass at significantly lower velocities than with W-W cases.
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Campfire 'Bwana
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Campfire 'Bwana
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All I did was answer his question......
I went with the 7x300 for the reasons I stated.
We all know about your passion/obsession with the Mashburn.
Little late in my BG hunting career to worry about "passion". and obsessions. I can't afford "passions", but I do know something good when I see it. You don't really know me at all. I'm not "passionate" about any cartridge. They are tools to me,to kill BG animals,and always have been.That's why I have used so many. But you could get that impression because I try to answer questions people askSo you can impute into what I post what you want. See ya later.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Joined: Jul 2012
Posts: 920
Campfire Regular
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Campfire Regular
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I'm not patient enough to form cases when 2860fps with a .661BC is easily attainable.
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Campfire Tracker
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OP
Campfire Tracker
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Bob, Good to know regarding Retumbo. I honestly need to give the 7mm Rem a better try. I will admit to having less time and therefore (or is it therefor in attorney) give up on a rifle if something doesn't work within 3-4 loads.
I have a 6.5 pound FN Mauser in .375 in a Bansner that I have been thinking of doing something with. That may make a good Mashburn if I can find a smith willing to work with a Mauser.
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Joined: Jan 2007
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Campfire 'Bwana
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Campfire 'Bwana
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DMD: Hagels Mashburn was on an FN Mauser IIRC.
If you need a reamer we can scrape one up somewhere.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Joined: Jan 2005
Posts: 22,884
Campfire Ranger
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Campfire Ranger
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Just freebore your 7RemMag as it sits, get some good brass, H1000, 160-162 grain bullet, and be done with it.
Your not loading it to its potential. You need to figure out those problems first before building something else.
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Joined: Aug 2002
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Campfire Outfitter
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Campfire Outfitter
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I know it's fun to tweak a cartridge or load and pushing it to find a better whatever.
I shoot a simple Tikka SL in 7 RM. My load is a simple 175 Gameking at 2,950, maybe that is moderate to some thinking.
But, when I hit steel at 1,200 yds with a good smack, I know I have enough to do anything I want with it.
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Campfire 'Bwana
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Campfire 'Bwana
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I know it's fun to tweak a cartridge or load and pushing it to find a better whatever.
I shoot a simple Tikka SL in 7 RM. My load is a simple 175 Gameking at 2,950, maybe that is moderate to some thinking.
But, when I hit steel at 1,200 yds with a good smack, I know I have enough to do anything I want with it.
That pretty much sums up me and the 7 RM anymore. It's like a 270 or 30/06 and just does what it does.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Campfire Tracker
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Campfire Tracker
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Here 's a picture sent by Rick Camuglia. Rick runs a Mashburn with 195's to 1500+ yards. On the left is a 7 Rem mag, in the middle a 7mm Mashburn Super, and on the right a 300 Win Mag. We can easily see the 7 Mashburn and 300 Win Mag are longer. Th mash burn has the longer neck.Hader to see but it also has less taper. It does not look that much bigger but a charge of 75 gr of H1000 does not even come to the base of the neck! Water capacity is 90 gr. How'd that happen? Smarter guys than us worked htis out in the 1950's,and optimized the cartridge to give OVER 3000 fps....with a 22" barrel....with a 175 gr bullet. The most modern 7mm magnums don't really beat those performance levels by all that much. To wildcat the 7RM where you gonna go? Blow it out? it'a already pretty straight. Blow the shoulder forward? That makes the neck shorter than it is which is already a drawback.Compromises bullet seating. Simply put the 7RM does not have enough case to work with if you want the next step up in velocity. ![[Linked Image]](http://i1187.photobucket.com/albums/z395/BobinNH1/ATT_1445402890453_IMG_3292.jpg) Dang I wish there was a website that had accurate case capacity data. Does anybody know of one? That 300WM necked to 7mm would appear to have greater capacity, although case taper is hard to gauge. But according to this, it doesn't? 7x300 Case Drawing Maybe it's differences in measuring methods?
FÜCK Jeff_O!
MAGA
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Campfire Regular
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There is precious little difference in case taper between the MSM and the Practical. The Practical has more case capacity.
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Campfire Tracker
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Bob and I have been fooling around with the 7 RM since the early 80's.
I had an Echols Legend and several others. I tried longer throats.
All had very good custom barrels. The best you are going to get, on average, is 3200-140, 3125-150, 3050-160, and 2950-175. If you get much more it is because of higher than normal pressures.
I have had so many custom 270's that I can't count them. The longest were 25". I have never gotten over 2900 with a 150 without very high pressures. I am going to try R26 and 7977...perhaps they will deliver more.
Is the 7 more? Well yes the numbers are bigger, no question. Does it translate into a decisive in the field difference? I can't see any difference until you get to the 175's and then the big 7's are more like the big 30's. Me, I can't tell the difference in recoil between a 175 or a 180 at 3000+. Both have more recoil than I want to deal with so I use a 270.
The 7 RM is what it is...very good but neither magical nor mystical. Actually, I don't think anything is.
Last edited by RinB; 05/17/16.
“Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away”.
Antoine de Saint-Exupery. Posted by Brad.
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Posts: 35,900
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2007
Posts: 35,900 |
Agree with everything RinB says. Also he had a reamer for the 7mm/300 Win back in the 80's,so there is absolutely nothing new going on today,except we have more and better LR bullets now.
Another friend built a rifle or two for the 7mm/300 Win. His nickname was Maximum Moe. He used to blow 130 7mm bullets out at 3600 fps and kill caribou at 600-700 yards.
It is good to see the boys today think that they have discovered new stuff, and try to sort out tiny differences in case shape and capacity. Actually there isn't a dimes worth of difference in killing effectiveness between these various 7mm magnums and we are about as well served with one as the other. The more game you get to kill the more apparent this becomes.
Continue!
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Posts: 10,366
Campfire Outfitter
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Campfire Outfitter
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Posts: 10,366 |
It is an intelligence test. You are being timed. a) How long does it take for you to learn not to try to talk someone out of their wildcat idea? b) How long does it take you to learn not to do your own wildcat ideas any more? Below is the answer book. I got it! I got it! Never say there no real improvement in the wildcat with 10% more powder and 1% more velocity. I got it! I got it! All the wild cats I tried and all the wild cats I designed were not practical. ![[Linked Image]](http://i757.photobucket.com/albums/xx220/ClarkM/0500Leadballnosquish4-11-2012.jpg) This is my 50CB based on the 56-50. It can stop a coon with a body shot, and sounds like a BB gun. I am looking for those who would like to licence the idea.-said the delusional man
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps
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Campfire Tracker
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Campfire Tracker
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Yes I had a 7-300 Win reamer made and some dies. Magnum Mo was one of my shooting buddies. He started with the 7RM got frustrated, went to the 7-300 Win, then the STW.
Then he went to a 270 with 26" a barrel and a long throat. He got about 100fps over my 22". Gain was about 25fps per inch of barrel.
Last edited by RinB; 05/17/16.
“Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away”.
Antoine de Saint-Exupery. Posted by Brad.
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Posts: 35,900
Campfire 'Bwana
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Campfire 'Bwana
Joined: Jan 2007
Posts: 35,900 |
Whelen Away: Here you go. I think this is a drawing of my Mashburn reamer so you can play with numbers. My eyes are too fuzzy in the middle of the nite to start playing with numbers.  I have measured once fired Masburn WW cases many times. They hold 90 gr of water to mouth of case. Ditto for all my pals who now have Mashburns. Other than a shorter neck there is precious little difference between the Mashburn and the 7mm/300 Win. They are both very good cartridges. ![[Linked Image]](http://i1187.photobucket.com/albums/z395/BobinNH1/20141215_110930.jpg)
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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Joined: Feb 2003
Posts: 10,366
Campfire Outfitter
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Campfire Outfitter
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BobinNH
I have a 7mm mag. Why do I need all that other stuff? Why do I build anything other than 7mmRM rifles? I don't have to make sense. It is a hobby.
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps
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Joined: Jan 2007
Posts: 35,900
Campfire 'Bwana
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Campfire 'Bwana
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BobinNH
I have a 7mm mag. Why do I need all that other stuff? Why do I build anything other than 7mmRM rifles? I don't have to make sense. It is a hobby. That's right Clark. During all those years Rick and I hunted and worked with the cartridge, we thought of building another wildcat. Mostly we just stuck with the 7 RM because ,despite all the minor squawks, it killed really well with good bullets. It wasn't until 5-6 years ago that I decided to build another custom rifle, mostly because I enjoy fiddling with rifles and I was bored. I really didn't expect miracles.
The 280 Remington is overbore.
The 7 Rem Mag is over bore.
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