The proper use of a headspace gauge is the most reliable method for assessing the length of a rifle chamber. Headspace refers to the distance between the breech face and the base of the cartridge when the action is closed. This measurement is crucial for ensuring the safe and accurate operation of a firearm. By using a headspace gauge, one can determine whether the chamber length is within acceptable limits.

• Extensive range of rimless gauges in large calibers
• Engineered from premium-grade, hardened steel and meticulously precision-ground to meet stringent ANSI and SAAMI specifications
• The headspace tolerance is precisely ground to an exacting specification of +/-0.00015 inches
• Each headspace gauge is meticulously inspected using NIST-certified measurement instruments