8mm Mauser


January 23, 2008, 02:42 PM
I tried the Mauser Central website. Appears to be down or closed.

What are the different ones?

I see 8x57JS, 8x57JRS.
Some are .318, some are .323 caliber.

My brother has a Mauser 98 in 8mm.

I would like to get some Norma cases for him.

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January 23, 2008, 02:58 PM
A Mod. 98/G98/K98/M24/M48 = 8mm mauser = 8x57JS = 7.92x57JS = .323 projectile dia.

Norma is pretty much the best brass for that round you can find here in the states.

January 23, 2008, 03:21 PM
8x57JS or 7.92x57JS are names for permutations on the famous 1905 high pressure spitzer loading of the 8mm Mauser. There is an earlier 8x57 with a slightly narrower RN bullet and lower pressure but these days it's only used in archaic Commission Mausers and the handful of Mauser G's that weren't switched over to JS. The issue comes in in that all SAAMI approved loadings for the 8x57JS have been massively downloaded in case some knucklehead tries to shoot one out of an unconvered Commission Mauser and blows himself up. Domestic 8x57JS is as a result pretty much useless. But there's a lot of modern European factory loads available and handloading is real easy with the round. Norma brass is fantastic and will last a long time.

WARNING--8x57JRS with the "R" in there is a RIMMED round for use with German drillings and single shot rifles. They are the same round but have a big rim on them and will not work in a Mauser. Also I believe the JRS may be loaded a little lighter for old drillings.

January 23, 2008, 03:22 PM
8x57JRS is the same as 8x57JS (.323 diameter) except that it is rimmed, hence the 'R' in the name.

Any Mauser built after 1906 or so is going to be .323 ('JS').

+1 on the Norma brass.

January 23, 2008, 03:23 PM
Darn, Cosmoline beat me to it.

January 24, 2008, 12:10 PM
On Midway website:

Norma Brass 8x57mm J Mauser (318 Diameter)

Norma Brass 8x57mm JRS (8mm Rimmed Mauser)

Only Winchester and Remington were listed under 8x57 Mauser.

I can't find Norma 8x57 JS brass anywhere online.

Do I re-size the J Mauser brass or just use Win/Rem?

S is for spitzer.

Is J for jager (rifle)?

Jim Watson
January 24, 2008, 12:18 PM
You could load the J brass for S ammo, the expander plug will enlarge the case neck by .005" without any trouble.
I would use Winchester brass, no sense paying extra for Norma brass in a common caliber.

J is equivalent to I in German and stands for Infantrie.

cracked butt
January 24, 2008, 12:50 PM
If you are going to find a rifle in 8x57J, Its most liley to be in a commision-88 rifle or a commercial sprting rifle- a lot of sporting rifles were produced chambered for the earlier cartridge even after 1905

About the only place you'll find a rimmed version of the 8x57 would be in a drilling.

January 24, 2008, 01:16 PM
J is not for jaeger. Rifle in German is gewehr. Jaeger means 'hunter'.

The J is not a 'J' but a stylised 'I' and as Jim Watson pointed out, stands for Infanterie. The early-20th century German script was very stylised and American/British scholars thought it was a 'J'.

It is possible to load J brass for JS loads.

January 24, 2008, 01:25 PM
Ironic that the 8mm Mauser isn't Mauser. I suppose "8mm Bastard Spawn of a Government Commission" is a bit unwieldy.

January 24, 2008, 05:07 PM
Well, practically speaking, it's a modified Swiss case that Col. Rubin came up with...

And no, NO German sporting arms after 1905 were made with .318 bores. It became illegal to do so in 1905, when the Reichsjegermeister decreed the military standard to be the only chambering allowed in newly made firearms in Imperial Germany.

January 25, 2008, 10:01 AM
Yes, derived from Col. Rubin's efforts, and not 8mm either measuring 8.2 mm.

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