Hi, I've been searching the Internet for information on the actual measurement of dimensions for headspace, the chamber diameter and length, the throat length, the leade angle, and so on, but everything seems to amount to: use a go/no-go gauge set, and you're done!
That's not what I'm looking for. That amounts to a dummy check. I want to measure, with 1/1000" precision, the actual numerical dimensions for a given barrel and bolt combination, before firing a round. As far as I can tell, cerrosafe castings are the only way to do that without firing a round, but I see mentions of it shrinking as it cools. I've found more directly useful information at this page, but the interpretation of the casts appears to be subjective--not an objective set of measurements.
How would you exactly measure these parameters, before you ever loaded a round into the firearm, before you ever sat down at your reloading bench to make up ammunition?