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Offline Dixie Dude

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8 MM differences
« on: August 08, 2007, 10:13:53 AM »
What is the difference in 8mm Mauser, 8mm JR, and 8mm JRS?

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Offline John Traveler

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Re: 8 MM differences
« Reply #1 on: August 08, 2007, 10:43:04 AM »
If I remember my cartridge development history, the 8mm Mauser (7.92mm x 57) was initially developed in 1888 as a smokeless powder military cartridge using a 0.318" diameter round-nosed bullet. 

Years later (1905), the bullet profile was changed to a spitzer (pointed) with a .323" diameter, making that cartridge unsafe to fire in earlier, smaller bore 8mm rifles.  The early sporting version of the 8x57 rifles continued to be manufactured using the tighter bore ammunition and were identified as 8x57J and 8x57JR indicating a rimmed version of the cartridge.  The final development of 8x57JRS was a cartridge that used the larger diameter spitzer bullet in rifles chambered with a longer freebore to allow safe firing of the .323" bullet in a .318" bore.

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John Traveler

Offline Dixie Dude

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Re: 8 MM differences
« Reply #2 on: August 08, 2007, 10:49:27 AM »
So, if I am looking to order ammo for a Yugo Mauser, it should be the 8mm JRS?  Or, just plain 8mm Mauser ammo?
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Offline John Traveler

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Re: 8 MM differences
« Reply #3 on: August 08, 2007, 11:08:12 AM »
The Yugoslavian mausers were built on German designed and installed production machinery and made to German military standards.

The Yugo mausers fire standard 7.92x57 ammunition using .323" bullets same as all the German, Turk, Cxech, Polish, etc mauser 98's made after 1905.
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John Traveler

Offline Mikey

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Re: 8 MM differences
« Reply #4 on: August 08, 2007, 11:15:33 AM »
Dude:  just plailn jane ol 8mm Mauser ammo.  Jon Traveler is correct and for the 8mm Mauser there are lots of sources for new ammo and older surplus.  Check our sponsor list - at least one of our sponsors should have lots of it.  I like the Portugese surplus - accurate and reloadable.  I avoid the Turkish surplus.  Greek is good if you can find it.  S&B makes about the best factory hunting ammo you can find and it is not expensive.  
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Offline Dixie Dude

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Re: 8 MM differences
« Reply #5 on: August 08, 2007, 11:22:39 AM »
I was looking at Mid-South shooters supply, and that's the problem.  Sellier & Ballot has 8mm Jr, 8mm JRS, and 8mm JS.  All about the same price.  Didn't know which one to order. 
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Offline TribReady

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Re: 8 MM differences
« Reply #6 on: August 08, 2007, 12:12:25 PM »
    ;)   JS 
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Offline Dixie Dude

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Re: 8 MM differences
« Reply #7 on: August 08, 2007, 12:29:12 PM »
Thanks
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Offline supratriumph

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Re: 8 MM differences
« Reply #8 on: August 20, 2007, 11:29:32 PM »
The R's in JR and JRS stand for rimmed cartridges.  The military mausers are rimless(the extractor rim is the same diameter as the casing).
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