German semi-rimmed sporting cartridge for double and combination guns; a lengthened 8x57mm designed for German express-style guns requiring a semi-rimmed case.
Type: Rifle
Introduced: 1922, Germany
Parent case: 8x57mmJS (lengthened, semi-rimmed)
Standardization: CIP
Bullet diameter: 0.323" (8.2 mm)
Rim type: Semi-rimmed
Primer: Boxer Large Rifle
Production status: Active
Also known as: 8x75 RS · 8x75mm RS
History: Developed in 1922 as a semi-rimmed 8mm cartridge for German break-open double rifles and combination guns that require a rim for reliable headspacing. The 8x75RS offers more powder capacity than the 8x57mm IS and is still CIP-standardized, produced by RWS and used in high-grade German double rifles.