The Sinclair Chamber Length Gauge allows handloaders to measure the true length of their rifle's chamber, indicating potential excess case length over published trim lengths.
It is made of 12L14 soft steel to avoid damaging the chamber and includes step-by-step instructions for reuse.
This 7mm gauge is not suitable for use with certain thin-necked or tight-necked cases and should not be used in handguns or specific types of rifles.