I know very little about this cartridge, other than it was a precursor to the 7mm Rem. Mag. Anyone have any info, such as the developer, size, uses, performance, etc.?

Kyle

I think it is very similar to the 7x61 Sharpe & Hart

Without looking up the specific details it's a magnum length cartridge that propelled a 175 Partition fast enough to be a completely satisfactory long range big game cartridge.

Some of the worlds most experianced rifleman used this cartridge including Bob Hagel and Warren Page. This says volumes about it.

It is not at all like the 7X61 S&H which is a fast taper belted round that never made any impact on the market.

Today the 7mm STW is the Mashburns commercial equivalent.

Read Bob Hagel. He is the last word on rifles, cartridges and bullets like this. If the monolitic bullets ever get perfected then we may have a new opinion that is valid.

Get a copy of Rifle magazine issue #103. It has a very good article on the Mashburn by Bob Hagel. I have three barrels chambered for this cartridge. The muzzle velocity average is 3225 fps for the 160g bullet and 3000 fps for the 175g. Two of my friends had guns made up that posted velocities over 3300 fps for the 160's. My barrels were very, very accurate--and they were rechambered factory 7mm Remington mags from Remington. My cases are made by using a form die which neck downs .300 Win mag cases and forms it. Cases made from .300 H&H require quite a bit more work.

Sambubba,
My slim reference to the 7mm Mashburn has the case capacity at 83.4 grains of water. Would that be full to the case mouth or just to the base of the neck?
Regards,
HockeyPuck

A late uncle of mine used a 7mm Mashburn Magnum
for years that was built on a 1917 Enfield action
and used it mostly for deer. He also had a 10.75mm
built on a 1917 action. My other family members
that hunted with him didnt find anything unusual
about the 7mm rifle. I sure wish I had it now
just for a keepsake, of course none of my family
members remember what happened to both of these
guns.

Hockey puck, I don't know how they take this water measurement. I know my Mashburn will take 74.5g IMR 7828 behind a 160g Nosler for over 3200 fps from a 24" barrel. Warren Page recorded 3050 fps for the 175g Nosler from a 22" barrel. This is quite a cartridge and is the one Remington should have standardized.

Sambubba,
This is the method we use: resize the case without removing the primer, or fill the empty primer pocket with modeling clay; weigh and record the weight of the empty case; use an eyedropper or hypodermic needle to fill the case with distilled water; fill the case until there is a slight bubble of water at the case mouth; use a tissue to wick the bubble down until the water is even with the case mouth; weigh the filled case. The difference is the case capacity in grains of water.
The beauty of using this method is that it's easy to compute the seating depth of the bullet and figure out how much water would be displaced by the bullet.
There is a water displacement calculator that does exactly this on the free downloads page at www.aement.com.
Regards,
HockeyPuck

If I recall correctly there were 3 versions of the 7MM Masburn Mag.
Per the Ackley Handbook, the super mag was made by shortening 300 H&H cases to 2.630.

He shows highest vel loads with 160 gr as 74 gr 4831 @ 3270, and 175 gr as 73 gr 4831 @3175.

Jerry

Measuring my reamer for the Super Mashburn Magnum. Here is some following dims.

2.650" OAL of case
.375" neck length
.495" shoulder dia.

I have one of seven reamers that JGS made in the last 20 years. Made one gun up for the customer and he had fun with it.

Definitely Bob Hagel's book, "Practical Ballistics for the American Hunter" has info. on that one.

[ 04-28-2003, 14:13: Message edited by: sscoyote ]

Bob's book you mentioned is my all time favorite and I feel the best book ever written on the subject. Get it if you can!

I am on my third 7 Mashburn Super tube and putting a 4th on fairly soon.

I really like the round-will it do anything that others won't no-but it is really fun (for me) to do something that most others don't have.

Plus I was fortunate to of met Bob years ago in the mid 80's and have called him a friend ever since. He took in this young,inquisitive, young man that was full of P and vinegar and taught me a ton. Absolutetly one of the best writers of time.

To the gun I'd be a bit careful about trying to stuff 74/7828 in it. From my experience that load would be popping primers for sure and perhaps would freeze the bolt.

I typically use IMR 4350 and a 139 Hornady to fireform cases. I get excellent velocity with this load and some kind of fantastic accuracy! Me thinks I'll have tio try it a bit on game this year.

I use 7828 with the 160 Noz for most all of my hunting, that and the 150 Noz BT has taken most all of the game I can remember. The loads I use run 3150 for themost part although I can boost them to 33 if I like.

The 175 also gets some use although not as much anymore (that's what I used for years b4), I now use R25 and it works well and then some. 3000 is the range this will run.

It's a neat round and I own a reamer, it resides at my smiths shop. Let me know if you have ever interest-I'll hook you up with him and he can get you a going.

"GET TO THE HILL"

Dog

Mark, I throated mine like Bob suggested with the 160g Nosler seated to the base of the neck. This load is what he used in Rifle #103 for his two test rifles. I have safely used this load in three barrels. I also have my own reamer for this cartridge. Just out of curiousity, how are your's throated?

I throated mine the same way as per instructed by Bob.
I do love the round regardless of what load it's using.

"GET TO THE HILL"

Dog

mines gonna spend the next day and a half looking a yogi

You know Mark, i never met the guy, but had his book a # of years ago. Lent' it to a friend, and bingo, it was gone. Missed it so much i ordered it and, "Guns, Loads, and Hunting Tips" again, i think from Wolfe Publishing. I have to agree with you, i do believe that man found his calling in life as a gun writer.

ssyote-the thing I love about the man is that he has truly done it, and he did it b4 he talked about it. And without predudice and without being a pimp!

In this day and age we have so many Daniel Boone want to be's. From writers to hunters it constantly amazies me about the BS some people try to shovel. Then too there is the book worm type that have a fair bit of coin, so they have all of the toys and darn few skills!

I do a fair bit of guiding, I also work in a gun shop a bit and I shoot at the range quite a bit and I am constantly amazed at the way many hunters and shooters carry themselves.

As Askins once said these types of people have mostly killed a couple of deer and one sickly cow elk. I'd add to that if they have taken much in the way of game I always like to see what they have taken by themselves, and not on a guided trip.

Oh yeah where was I -I do really love the 7 MS-it'll be on the hill again tommorrow for yogi.

Sorry about the ranting-just sort of had a belly full of certain hunter/shooter types latlely-bet you couldn't tell eh?

"GET TO THE HILL"

Dog

(ps it is snowing like crazy here tonight!!)

I have a 1959 Gun Digest where Bob Hagel has written an article called long shots at big game. There is a picture of his favorite rifle chambered in 7mm Mashburn Magnum in this article.

quote:

Originally posted by kiwiwildcat:
I have a 1959 Gun Digest where Bob Hagel has written an article called long shots at big game. There is a picture of his favorite rifle chambered in 7mm Mashburn Magnum in this article.

..Intersting indeed!.

What page may I ask?

This post http://forums.accuratereloadin.../9411043/m/142108376 shows some original data sheets from Mashburn Arms Company.

quote:

Originally posted by sambubba:
Hockey puck, I don't know how they take this water measurement. I know my Mashburn will take 74.5g IMR 7828 behind a 160g Nosler for over 3200 fps from a 24" barrel. Warren Page recorded 3050 fps for the 175g Nosler from a 22" barrel. This is quite a cartridge and is the one Remington should have standardized.

That's good performance from a 22" barrel. I have to use a 26" barrel to get 3050 from a 175-grainer in the 7mm Rem. Mag. Takes exactly 70 grains of IMR 7828 to do it.

To answer the original question, think of this as a 300 Win mag case with the shoulder pushed back and a sharper shoulder angle and nice long neck(capacity greater than a 7 Rem and less than a 300 Win).Have to agree with Dober that I loved mine and it hits the sweet spot for a 7mm with both 160 & 175 loads.
Randy

I have been hunting with the Mashburn for 15yrs and would not trade it for anything IMO it is the best 7MM caliber. I started with 300 H-H brass but now use 300 win mag. All that does is save on trimming time. I use IMR 7828 and 140gr barnes TSX for everything. I shot an Elk at 225yrds laying down and he was never able to stand up. I also had dies made by Hornady that work great

the 7mm MSM was Bob Hagel's favorite cartridge and he writes about it in several of his books including load data-of the time-proportionally relative today. Good and very capable Cartridge.

The picture of Hagel's rifle laying against a Caribou is PROBABLY the most reprinted picture of a rifle ever. It's in just about every article and book ever written about 7mm's, and caribou hunting. IMHI...
Gene