The Sinclair Chamber Length Gauge helps handloaders determine their rifle's true chamber length from the bolt face to the chamber's neck end, indicating possible excess case length.
Made of 12L14 soft steel to avoid chamber damage, the gauge is used with a fired, unprimed shortened case to measure overall length after insertion and extraction from the rifle.
Not compatible with certain calibers like the 22 Hornet or 30-30 Winchester, and should not be used in handguns, semi-automatic, lever, or pump action rifles.