Originally Posted by The_Kid
I partially neck size a case as to snugly hold a bullet from gravity but can be pushed in easily. Insert a bullet so it sticks out a good deal. Chamber that round then eject it as to not let it fall; measure the COL. Repeat the chambering process as to make sure that length is correct.
That is exactly how I do It. A couple of times to verify and that method works better than any gauge you can buy. IMO After I get the measurement I shorten up by .030 and start working it.
Ruger Vaquero .45 Colt, SR40, SR9c, 22/45, 10-22, 77MKII, PT 1911, Ruger Blackhawk .45 Colt/acp