Identifying this Mauser and the cartridge it takes

SkullKeeper

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The bore mics roughly about 0.350 +/- at the muzzle. The magazine box length measures 3.30” internally. And that’s about all I know. I will get a chamber cast made this week but if someone can provide some insight it would be greatly appreciated.
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Probably 8mm or 9mm x 57, chamber cast would be the real way to identify it positively…looks a bit like an original Mauser sporter, but I suspect it’s built from parts (not original) it’s cool nonetheless
 
Probably 8mm or 9mm x 57, chamber cast would be the real way to identify it positively…looks a bit like an original Mauser sporter, but I suspect it’s built from parts (not original) it’s cool nonetheless
A .358 bullet will almost go in the muzzle - my thoughts are it’s a .358 something. All the receiver, bolt, and barrel numbers match so not a parts rifle but seems to be a rebore and maybe rechamber
 
Seems I remember that .358 IS 9mm? I think friends were once discussing how lucky it would be to have a 9mm bore come out exactly .358 due to bullet choices. There is a lot of variance in "9mm"
 
Seems I remember that .358 IS 9mm? I think friends were once discussing how lucky it would be to have a 9mm bore come out exactly .358 due to bullet choices. There is a lot of variance in "9mm”
I was thinking that 9mm is .360” … but as you say there probably is a variance
 
It is stamped as 7.9
In my opinion this is: 7.92×57mm Mauser. (also known as 8mm Mauser, or 8x57)
Commercial designation 8x57 JS
Bullet diameter .324
 
It started life as an 8mm Mauser but if it has a .350” bore then I’d think it would be rebored to something like a 35 Whelen.
The 9X57 is possible but I don’t know why anyone would choose that in a rebore.
btw, the 9X57 uses a .356” bullet but most owners just use .358s when reloading.
 

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