Justin, there are lots of ways to measure chambers that don't require engineering tools. Simplest is to spend $39 with Galazon online and buy a brass multi-guage chamber guage. Just poke the appropriate guage into the chamber till it stops and read the chamber length. Next simplest is to run a little steel ruler into the chamber while holding the barrels up to a light source, stop at the 'shadow' where the forcing cone starts and read the length...Geo