I resize in a process similar to mathman's above. I full length size all brass to just smaller than a crush fit in the gun it is to be used in. This will allow you to get a lot of firings. I have some factory chambers that have gotten 17 firings and still counting with this method. One of my guns will only allow 5 or so firings depending on the load before the brass starts showing signs of getting tired.

"Is there a way to measure with calipers to see if I am in spec"
The spec you need to meets is your guns chamber.
jmho
Tim

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
Albert Einstein

At Khe Sanh a sign read "For those who fight for it, life has a flavor the protected never knew".