There were 2 different bullet diameters in 8 X 57 Mauser:
.318 Bullet "J" the older version
and
.323 Bullet "S" is the modern bullet size and used in our standard 8 X 57mm Mauser dies.
When an "R" is mentioned, it means the cases are Rimmed and uses a #14 Shell Holder.
We have found sizing dies for the J type are no longer available, except on a custom basis.
If the brass you plan to resize came out of the rifle you plan to shoot it in, then a Custom Collet Die Set could be used. We would need a dummy round (bullet seated in an empty case), 2 fired cases and 2 bullets to make a set for you.
