Producing 8X56mmR Kropatschek cases from 45/70

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CanadianLanBoy

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Hello all,

This is my first post on this forum, so I apologize if I am not following etiquette I have not picked up on yet.

I am looking into getting a Kropatschek long rifle, and I have been doing quite some research on forming cases. Most use 348 WIN, or 50/110. I was wondering about using 45\70 as a parent case, as it is much more economical. Looking at the dimensions it is only 1mm smaller at the base, a rim .3mm less in diameter and a rim 0.1mm less in thickness. It is a tad short, but combining that with stretching during forming, and use of long bullets it would seem to be a non issue.

(Case Dimensions)
https://imgur.com/a/KzDv0aA

Anyone ever tried this?

Appreciate any replies
 
The rim dimensions don't worry me but that 1 mm smaller at the base is a concern for me, I would be worried about getting a face full of powder blowback from split/separated cases with the pressures attainable in a smokeless powder cartridge...I might try it if it were a BP cartridge but not smokeless.
 
1 mm = .0393. Thats just to much case expansion. It may not let go the first time, but it's definitely asking for trouble.

I load for my Kropatschek rifles as well.

I went through a lot of hassle to round up original cases. To my knowledge, nobody makes the case anymore, not even Privi. The reason for this is of course lack of demand. There weren't a lot of these extremely well made rifles built. The only issue I have with these is that they are BERDAN primed.

For those that don't know them, these rifles were built in Austria, by Steyr, for Portugal. The fit and fitting of all parts is exceptional.

Like the 303 Brit, the 8mm Krop is a transitional cartridge. Black powder to smokeless and there were some changes made to the case as well.

The parent case is the 11.15x60 Mauser.

Not cheap, but Bertram makes the brass as do others.

Luckily these old rifles use .323 diameter bullets. I load mine with both cast lead, over black powder and 175 grain jacketed over smokeless.
 
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