The Sinclair Chamber Length Gauge helps determine the true chamber length from the bolt face to the chamber's neck end, revealing excess case length over published trim lengths.
Made of 12L14 soft steel to avoid chamber damage, the gauge is reusable and comes with step-by-step instructions for proper usage.
Specific caliber limitations exist; the 22 caliber gauge won't work on thin-necked cases like the 22 Hornet, and the 30 caliber gauge is incompatible with the 30-30 Winchester.