The Sinclair Chamber Length Gage allows handloaders to measure the true chamber length from the bolt face to the chamber's neck end, revealing potential excess case length.
It is constructed from 12L14 soft steel to avoid chamber damage and comes with step-by-step instructions for repeated use.
The gauge is not compatible with certain calibers and firearm types, such as thin-necked cases or tight-necked chambers, with specific exceptions noted.