Gas blowing back in 8x57?

[muskeg13]

The M95 Steyr does use an 8mm Rimmed cartridge, not the 8x57mm.

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Some 123,000 M95s were converted to regular rimless 7.92x57 Mauser. The conversion included replacing the sights and modifying the magazine to accept Mauser stripper clips, eliminating the En bloc set-up. http://www.hungariae.com/Mann95Se.htm

The vast majority of M95s were rebored and rechambered to 8x56R, which is .329-.330, and many of these more common conversions involved cutting WW1 long infantry rifles to carbine length.

[winston10]

None of the M-95's in 8x50mm were rebored at all when rechambered to the 8x56r . Same bore size, same barrel with same size land and groove .

[Dhall_37]

Thanks for the advice guys. I have some other projects going too. But soon I’m going to anneal and bump the charge up in a latter type deal and see if that’ll keep the gas blow by down.

I shoot reduced cast in my carcano with H4895 and have good results and not much blow back. I think It definitely just needs to be bumped up some. I’ve read that fast burning powders in larger cases can sometimes act funny if reduced too low.

[Dhall_37]

Stupid question....is the straight pull M95 an 8x57? I thought they were a rimmed cartridge?
And my experience with PPU brass is it is very hard, compared to others.

It’s a special M95 (M95M) converted to 8x57, a fixed mag, stripper clip guides and a Yugo Mauser barrel!