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8mm German Mauser
also called 7.9x57mm Mauser, also 8x57mm Mauser in J, JS, JR, JSR
The 8mm German Mauser is one of the worlds best rimless case military cartridges and still today.  
It was used in both World War I and World War II by many major countries.
It was introduced in 1888 with a
.318" diameter projectile called the "J" 8x57mmJ, however it was changed to a
.323" diameter projectile called "JS" in 1905 and this new loading became known as the 8x57mmJS
There is also 2 rimmed case version (European Sporting  Cartridge) for bolt actions, combination  and drilling rifles.
Please Note: all 4 versions, J and JR in 3.18" diameter and JS and JRS in 3.23" diameter are still made today.

In summary there are 4 versions of the 8mm Mauser Rifle Cartridge, and links to all available:

J, which is .318" diameter projectile, with a rimless case.
JS, which is .323" diameter projectile with a rimless case.
JR which is a .318" diameter projectile and rimmed case.  
JSR, which is .323" diameter projectile with a rimmed case
also sometimes called and headstamped as
JRS.
Below are 4 links to each verision,
J -.318" (8X57MMJ) military and sporting cartridge (from 1888
to present day
) 'RIMLESS CASE'.  Click Here
JS -.323" (8X57MMJS) later military version, also sporting
cartridge (1905 to present) RIMLESS. Click Here
JR -.318" (8X57RMMJ) earlier European sporting cartridge
(1888 to present day) 'RIMMED CASE'.  Click Here
JSR -.323" (8X57RMMJS) later sporting cartridge  (1905 to
present) "RIMMED CASE" also called JSR,  Click Here
Rimless
and
Rimmed
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Rimless
and
Rimmed
Mauser JS
Mauser JR
Mauser JSR
Mauser J
Mauser J
Mauser JS
Mauser JR
Mauser JSR
LINKS
LINKS