The Sinclair Chamber Length Gauge helps handloaders determine the true chamber length of a rifle from the bolt face to the chamber's neck end.
Made of 12L14 soft steel, the gauge does not damage the chamber and is reusable, providing a way to measure if cases are being over-trimmed.
It is important to note that the gauge has limitations and is not suitable for certain calibers and firearm types such as handguns and semi-automatic rifles.