Brownells sells a kit that you use to make an impression of a rifles chamber.
It will basically make a cartridge based upon the chamber so that you can use that to determine the cartridge and throat erosion
It might be a way to identify the chamber before you start on the project
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Rule 1- ALL GUNS ARE ALWAYS LOADED
Rule 2 -NEVER LET THE MUZZLE COVER ANYTHING YOU ARE NOT PREPARED TO DESTROY (including your hands and legs)
Rule 3 -KEEP YOUR FINGER OFF THE TRIGGER UNTIL YOUR SIGHTS ARE ON THE TARGET
Rule 4 -BE SURE OF YOUR TARGET AND WHAT IS BEYOND IT
(thanks to Jeff Cooper)
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