The early version was called the 8X57J[rimless .318" bore],current version 8x57JS[rimless .323" bore], and both versions for single shots with rimmed cases have an "R" at the end of the designation.IE 8X57JR .318 "or 8X57JRS.323" [S is .323"]spitzgeschoss refering to 154gr spitzer bulles adopted in WWII.The J is a stylized German I standing for infantry.Harold