The second-generation JP semi-auto case gauge is specifically optimized for semi-automatic rifles, ensuring the functionality of your ammunition. If a cartridge fits within our gauge, it will be compatible with even a minimum-depth SAAMI chamber without any interference. Precisely calibrated to guarantee optimal performance and reliability in semi-automatic rifle systems Ensures ammunition compatibility with a minimum-specification SAAMI chamber Constructed from 416 stainless steel for enhanced wear resistance and increased longevity Evaluates all aspects of the .260 Remington, except for concentricity runout