8MM Mauser .............. cuz I don't know.

[triggerhappy243]

Helping a friend with a 8MM mauser rifle that was gifted with no information as to the correct chambering.

1. How many different 8MM mauser chamberings are there?

2. How many different bore dia. are there associated with the 8MM mauser?

3. Are there special markings on the barrel that should correctly identify what it is?

Reason I am asking to start.............. we Need to slug the barrel and have no idea what slug dia. to acquire.

[Walks]

Early 8X57 Rifles (1888) had a .318 bore. I believe the earliest 1898 rifles had the same diameter. About 1905 or so the bore was increased to .323 diameter & bullet shape was changed from RN to Spitzer. I believe this was called a 8X57 JS.
So a slug .323-.325 should suit your needs.
PURE LEAD ONLY.

[Texas by God]

A 00 buckshot will serve for a slug. Is it a 1888 Commission rifle?-.318. Early 1898 Mausers may have .318" but unlikely. .323"is normal for 98 Mauser and rebored/rechambered Turkish 1893s.
The 8x57S(.323") is one of the best cartridges ever invented. We like pics.

[ascast]

you did not say it was mil surp, or not. best to slug bore, maybe chamber cast. pic's r nice

[OS OK]

Selected content from this article in WikiPedia... 7.92×57mm Mauser... https://en.wikipedia.org/wiki/7.92×57mm_Mauser

Parent cartridge Patrone 88[edit]
The parent cartridge, upon which the 7.92×57mm Mauser is based, was adopted by Germany in 1888 as the Patrone 88 (cartridge 88) or M/88 (along with the Gewehr 1888 service rifle). It was a first-generation smokeless propellant cartridge designed by the German Gewehr-Prüfungskommission (G.P.K.) (Rifle Testing Commission), as the new smokeless propellant introduced as Poudre B in the 1886 pattern 8mm Lebel had started a military rifle ammunition revolution. The M/88 cartridge was loaded with 2.75 g (42.4 gr) of single-base (based on nitrocellulose) smokeless powder and a relatively heavy, 14.7 grams (227 gr), round-nosed ball bullet with a diameter of 8.08 mm (0.318 in). The M/88 bore originally had 7.90 mm (0.311 in) lands diameter and 8.10 mm (0.319 in) grooves diameter. The M/88 barrel bore specification was changed by 1894–1895 to 7.90 mm (0.311 in) lands diameter and 8.20 mm (0.323 in) grooves diameter to improve accuracy and reduce barrel wear in M/88 chambered arms.[4]

[Der Gebirgsjager]

Slugging the bore is a good idea, but if you'll post some photos of the rifle I'll bet we can come close at guessing the chambering, especially if it's still in "as-issued" condition.

[curator]

Some German 8mm Mauser rifles made before about 1935 were also chambered for the 8X60 Mauser cartridge to comply with the terms of the Versailles Treaty after WW1. A chamber cast might be prudent.

[triggerhappy243]

thank you all for this valuable input. I have not seen this rifle............ yet. I have some cerro-safe, but i do not think i have enough. And I will see if i can get pics too.

[Texas by God]

Please let it be a K action 8x52mm sporter[emoji16]

Sent from my SAMSUNG-SM-G930A using Tapatalk

[ulav8r]

8x52, 8x57, 8x60, ~.318 or ~.323, all good. Others might be possible but less desirable because of die availability.

[Combat Diver]

Don't forget the 8mm-06 wildcat.

CD

[Jedman]

I have a couple of 8 X 50 Lebel rifles. One has a .323 groove barrel and the French 1883 M 93 has a .330 groove barrel. I had a 8 X 56 rifle and it had a .329 groove.
Seems 8 mm can be what the maker wants.

Jedman

[Wayne Smith]

I have a couple of 8 X 50 Lebel rifles. One has a .323 groove barrel and the French 1883 M 93 has a .330 groove barrel. I had a 8 X 56 rifle and it had a .329 groove.
Seems 8 mm can be what the maker wants.

Jedman
Yes, but apparently what the OP is talking about is a Mauser - thus if standard either .318 or .323. That's even if it's been re-chambered for the 8x63 (8mmx06) cartridge, the bore will still be the same.