Rim Gauges for Shotgun Chambers

These gauges are used to determine the minimum or maximum depth of the rim of shotgun chambers.

The control of the depth of the rim recess is important for the headspace tolerance, which is 0,20mm for breech and 0,35mm for self loading shotguns.

The correct depth of the rim is achieved when the gun can be closed with the minimum gauge inside the chamber and cannot be closed with the maximum gauge inside.

This gauge is available as minimum type and maximum type. They are always used as a pair.