Home Forums Hunting & Shooting Custom Rifles & Wildcats The 7mm Mizzum

Swell. Point being "what"? You said noting I didn't know years ago.

So what if they are more "efficient"? They are also "slower".

You can read theory until the cows come home. If you want to move a 175-180 gr 7mm bullet at 3100+ fps from a 24-26" barrel (what I wanted) you can toss silly formulas out the window. You need capacity.The 280AI and 7 Rem Mag are also rans.

Ask Rick Camuglia and Dave 7mm what they think about the Mashburn when it comes to moving heavy 7mm bullets.

If I want to throttle back, I get 280AI velocities from my FF loads before I reach full Mashburn potential. Good for playtime and making cases.

I have had a slew of 7 Rem Mags and have shot out more barrels chambered for it than many have owned.

The 280AI interests me about as much as nothing and is a solid step in reverse. If i want one i can build/buy one tomorrow. I don't.

Reading QL is fine for home entertainment. Try chambering barrels and shooting.

Turning mashburn seeds into mashburn sprouts. All they need is a sprinkle of miracle grow(IMR 4350) and they will be fully grown

Sweet!

Bob, how many rounds did you get out of your 7mags, before they were shot out?

WCH; I never kept count on each barrel. I am not that organized.

If I were to give best estimate I'd say maybe a couple thousand rounds. But that's a guess.


I would also say they varied by make. I swear my Douglas barrels lasted fewer rounds than the Kriegers.

m

I've got a little over 700 rounds through one of my mashburns. Curious barrel life of a mashburn. Might have to text Dober and see how many rounds his have went before going belly up

Side note, it's easy to keep track of round count if you have separate bricks of primers for each rifle.

SamO I used that trick to keep tabs of total round counts annually. Not for individual barrels.

I had quite a few rifles running constantly.

Laker I would guess my Mashburn has about as many rounds as yours.....app 700?

Really no idea how many rounds a Mashburn takes. Still have my original tube.

Bob, thanks. That is about what I have found!

Talked to Dober and he said about 1700 rounds you start chasing the lands and about 2500 rounds things get pretty rough

30 degree shoulders and long necks are good jewjew.
dave

Sorry if my optimization algorithm offended you.
I own two 7mmREMMAG reamers and have chambered a number of rifles with them; Rem700, 98 Mauser, and Mosin Nagant.
Factory rifles 7mmRM; Ruger #1, Browning 1885, Sav 110, Rem700.
I have a bunch of 7x57 and 7mmBR gear too.
I am in the process of of chambering more 7mmRemMag rifles right now.
I build a lot of rifles with a lot of different cartridges, but I kill the most animals with 7mmRM. I consider it to be the most power, range, and accuracy for the average shooter in a 10 pound package.

Clark I'm not offended by optimization theories. The problem with them is that they say..."Well that case goes slower but it's more efficient per grain of powder."

Well so what? If you want velocity (performance) you may have to leave some "efficiency" on the table.

I simply don't agree that nirvana in a 7mm magnum case lies with the 7 Rem Mag. It starts to stall with 7mm bullets from 160 gr and up,where the real advantage to 7mm bore size exists.

I've found the 7mm Dakota/Mashburn cases to be more "optimum" with those bullet weights, without reaching for crazy capacity,because we still have to make rifles we can carry, and shoot accurately with barrels of moderate weight and length.

All the Mashburn does, is provide a longer neck and increased capacity for more velocity without going overboard.

Since you have the tooling,you could grab a Mashburn reamer and try for yourself. That's always more interesting .

One thing that frequently makes me chuckle are the calls I get from new Mashburn users who say...."I just dumped 75-78 gr of (whatever) H1000 in there and there's still lots of room!. This thing holds a lot of powder!"

I tell them that's the reason it will make a 160 gr bullet go 3250 fps., or a 175 gr almost 3100....if you want.

It's hard to get all excited about 7 Rem Mags after that....to me anyway. I have to ask,with todays better powders and super LR bullets 160 gr and up, what is "optimum"?

In a 10lb package? Whew, there is no way I'm packing a rig that heavy for general hunting. If it's a got a 45cal hole in the barrel I might consider it, but those are special purpose rifles. The Mashburn is the best overall in a magnum case, just as Bob and others have said, if the user wants to drive heavy bullets fast.

John: This is 7.5 pounds, as it sits. Easily manageable. I don't shoot long strings at animals....


This is custom but it does not need to be so complex. Something like a KS MR in 7 RM will weigh about the same, and requires no more than a reamer.

I'm afraid I don't get it. But then again I don't really care. It's obvious to me you aren't here for anything constructive.


10 pound 7 mags.....really? You just have to laugh at some of this stuff.

Not trying to defend Bob (who needs no defense), but as an unabashed 30-06 admirer I will say I have some buddies who convinced me to try the 7 MSM. I thought about it for a good while, because I have now two exceptional 30-06 rifles (that would have served me well for years to come), and the reason I was convinced to try the MSM boils down to a difference of 100 yards.

I use a Leupold 6x42 LRD on my primary 30-06. I sight the rifle in with either 165 or 180 grain bullets, moving at 2900 and 2800 fps respectively. I choose a sight-in distance such that the bullet doesn't more than 3 inches high at MPBR. For my 30-06 that means about 215 yards, and the bullet is 3 inches low about 275 or 280 yards away. Then the first dot of the LRD is about 300 yards, the second about 400 yards.

I can sight in the 7 MSM, with a 160 AB moving about 3200 fps, with the same 3-inch trajectory consideration, at 250 yards. I need to move to the first dot around 375 yards, and the second dot gets me to almost 500 yards. Some of this advantage is the starting velocity 300-400 fps faster than the 30-06. Some is the BC of the 7 mm bullets available.

The 280 AI and 7 Rem Mag use the same bullets as the MSM, but lack the extra velocity. The bottom line is I don't think they provide enough advantage to dedicate another keg of powder (because a new chambering for me means another keg of powder--I don't like to [bleep] around with too many powders) to my stores. But a 100 yard advantage out west hunting elk--that's a reason to give the MSM a spot in the gun safe. And my bigger than life buddy tells me the recoil won't be unmanageable...

...and I became introduced to a rifle that just happened to be chambered already in a custom quality Remington 700 package, complete with already chambered spare Lilja barrel.

Joel nothing much to defend. I sure don't feel threatened by efficiency experts.


Good luck with the new rifle. You will like it.

I've decided that life would be much more complete with a fast 7mm and have it down to 3 options after reading too many threads on here. Basically looking for a 160 at around 3100 but wouldn't be disappointed if velocity was slightly less. Input on which way you would go is greatly appreciated...

1)long throating a 7mm rem mag. Figure that if I keep over all length around 3.3 I should see some of the benefits of the weatherby with cheaper brass costs and be able to shoot factory ammo in a pinch.

2) 7mm weatherby, only down side is higher cost of brass and scarce factory ammo around here.

3) the mashburn. If i use a form/trim die is fire forming still necessary for full power loads? Also, I would like to have headstamped brass when possible if i travel to hunt. I've saw where quality cart. sells it but have heard differing things about the quality.