8x57, 8x57JS, 8mm Mauser, same thing?

trebor2880

trebor2880

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I've got a Yugo M48 BO Mauser 8x57, coming soon.
I've ordered 8mm Mauser-198gr.FMJBT ammo from CanadaAmmo.
I see that TradeEx has 8x57JS ammo listed,
and right beside it, there is 8mm Mauser ammo listed.
Different bullet weights. 8x57JS-196gr.FMJ, 8mm Mauser 129gr SP.
If it's all the same(what I am assuming),
why the 8x57, 8x57JS and the 8mm Mauser names.
If it's just to confuse me... mission accomplished!
 
Yes as long as it has IS or JS after it it was designed for the M98 action. I or J means it was designed for the older rifle, I believe the M88 Commission rifle.
 
Didn't know about the 7.92x57mm,
but did notice the "IS" one.
Googling was just further confussion,
would rather rely on info from this site.
Thanks Stevo and mosinmaster.
 
8x57JS uses a .323 dia bullet and the 8x57J uses a .318 dia bullet.
Not advisable to use the larger bullets in a bore designed for the .318 ones. Had a Turkish Mauser years ago and Norma was my only supply of the 8x57J.
 
mosinmaster said:
Yes as long as it has IS or JS after it it was designed for the M98 action. I or J means it was designed for the older rifle, I believe the M88 Commission rifle.
Click to expand...

The M98 came in 2 bores for the aprox 8 mm size. the J bore is .318" or 7.9mm, and the JS was .323", or 7.92mm. It was a way for the Nazi Germans to get around the non military arming treaty, as the JS was a sporting catrige, and the J a military cartrige... Any mauser built pre WW2 should have the bore carefully measured, as the .005" is enough to blow the gun up... Any G98 (the long barreled battle rifles) are suspect as being a J bore. A gunsmith can aparently bore the J out to a JS bore as ammo for the J is all but impossible to find... For the record, my CZ rework of a WW2 K98 likes the lighter loads, and shoots a lot of flyers with anything over 150 grain slugs... Might as well be using a shotgun with the heavier loads...
 
amosfella said:
The M98 came in 2 bores for the aprox 8 mm size. the J bore is .318" or 7.9mm, and the JS was .323", or 7.92mm. It was a way for the Nazi Germans to get around the non military arming treaty, as the JS was a sporting catrige, and the J a military cartrige... Any mauser built pre WW2 should have the bore carefully measured, as the .005" is enough to blow the gun up... Any G98 (the long barreled battle rifles) are suspect as being a J bore. A gunsmith can aparently bore the J out to a JS bore as ammo for the J is all but impossible to find... For the record, my CZ rework of a WW2 K98 likes the lighter loads, and shoots a lot of flyers with anything over 150 grain slugs... Might as well be using a shotgun with the heavier loads...
Click to expand...

Actually, the bore size in military rifles was changed from .318 to .323 in 1905. The civilian market used both, as it was claimed that the .318 diameter bullets were more accurate. After WW1 Germans were not allowed to own rifles chambered for the 7.92 x 57S cartridge, and so the 8 x 60I and 8 x 60S was born.
 
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