The Below Information Has Been Provided From Our Gun Caliber Dictionary And Is Meant For Informational Purposes Only. It Is Not Intended to Describe The Unique Specifications For This Ammunition.
The 8X57 JRS (8X57R JS Mauser) is the rimmed version of the 8X57mm Mauser, intended for use in single-shots and double rifles. The "JS" means that it is loaded with post-1904 .323-inch bullet diameter. — Craig Boddington
