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8mm brass 7mm stw

 
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  #1  
Old 02-29-2012, 05:56 PM
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8mm brass 7mm stw

Has anyone necked down 8mm brass (Who's) to 7mm STW? Does it have longer case life? Is it a better case than rem 7mm stw cases. I think 7.92x57 is 8 mm right.

Thanks
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Old 02-29-2012, 06:33 PM
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Re: 8mm brass 7mm stw

nope,

7.92x57 is the 8mm Mauser case. You're looking for the 8mm Remington Magnum Case.

I have not necked down 8mm Mag cases for my 7STW yet, but I would if I could find 8mm Rem mag cases. You'd also need a forming die as a .323" necked down to a .284" is quite a step. You'd probablly mess up the necks pretty badly. You need a intermediate sized die like a .308 or something to make it easier and neck it in stages. They do make them, however they are pricey.

Dan
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Old 02-29-2012, 06:54 PM
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Re: 8mm brass 7mm stw

Thanks,

I'll do some more research.
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Old 02-29-2012, 07:46 PM
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Re: 8mm brass 7mm stw

I have resized 8 mm Remington mag brass on several occasions, with good success. You must however, make sure your resizing die is bottomed out, and you must use lots of lube inside the neck. It will get you through in a pinch. Once in a while, you will split a neck. I have done this in the past, it works. The 8mm mag is the original parent case, as it is Layne Simpsons brainchild. Maybe someone will make some affordable brass that is decent. I have about 200 pieces of unfired brass now. Some of it is premium factory ammo. I bought it cheap from a guy who did not load, and sold his gun. I would have bought that to if I knew he was selling it. The last batch that I resized, shot well, and I got several firings from it. I neck size every other firing. Hope this helps.
AIM SMALL, MISS SMALL. 7 STW.
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Old 02-29-2012, 08:42 PM
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Re: 8mm brass 7mm stw

In the early years the only way to get 7STW brass was to neck down 8mm Rem mag brass. I've done at least a thousand cases by simply running 8mm mag cases into a 7STW FL sizing die and had no problems. I preferred the 8 mag cases even after 7STW cases became available because necking down cases usually results in slightly thicker necks which can then be turned down for maximum uniformity.
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Old 03-01-2012, 07:44 AM
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Re: 8mm brass 7mm stw

The comments here are really helpful, I really like my stw it is a truly great cartridge, power speed bullet selection, it's hard to get so much out of one rifle but the 7mm stw is a great catridge, so in my reloading, I want to be able to learn how to have a ready supply. It would be great if Lapua would adopt it. They seem to know the right metal mix for brass longevity.

Would annealing the 8mm rem mag brass be helpful?
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Old 03-01-2012, 07:46 AM
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Re: 8mm brass 7mm stw

i just did a 100 yesterday. Nothing but standard rcbs 7stw sizing die and hornady oneshot sprayed on the cases like any other time i size. Never had a single one get ruined. Loaded up 50 of them and the bullets seated just like in factory 7stw cases ive got so id bet the necks arent even in need of trimming. All rounds ran though the gun perfectly too.
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