[Brick]

In my case I use the gauge because I am loading for several cal. .45 ACP firearms.

The case gauge is cut to the minimum size of the standard chamber for whatever cartridge is being tested. So it checks for more than just case length. Any loaded cartridge that seats correctly in a case gauge should be able to seat and fire in the chamber of any standard firearm using that cartridge.

I don't gauge all of my cartridges, but I do gauge all of the cartridges that I'll be using in a match, though not always with the case gauge, sometimes I'll use the dismounted barrel from the pistol I plan on using in the match.