http://www.frfrogspad.com/intballi.htm
Arkansas Paul, a neighbor of yours from the north of Little Rock called and ask if I would have an interest in 100,000+ test fired cases complete with CUP imprint, I told him I would have no problem with loading the cases after examination but as to determining useful information from the cases the answer was 'no'.
Then I qualified my answer, if I was offered the opportunity to examine the cases (dimension, case head diameter and case head thickness) before firing and again after firing and then given the results of the CUP test for each case, the answer would be yes.
Even when copper billets are used for testing chamber pressure every batch is tested for yield, every lead billet batch is tested for yield, brass will support more weight therefore the amount of yield will be less, to measure the increase in case head diameter and case head crush would require an accurate gage that could measure .0001, better yet .00001.
So we are left with firing first with factory ammo to determine the expansion of the case head for a standard? for normal expansion, some say .0005, then someone will say they they fire cases 50 times with maximum loads (higher than normal loads) without maintenance to the case, .00025 expansion carried out to 50 firings = .0115 case head expansion, .0005 expansion carried out to 50 firings=.025 thousands, then there comes a times when case head expansion goes to .005 for one firing, that is the one that will be remembered, the primer pocket expands, the flash hole expands, the case head shortens and at the same time increases in diameter and the case requires extreme measures when removed from the chamber.
Then there is the standard answer, (it can't be done because of 'spring back' and if you did the results would not be accurate).
then there is 'absurd'
"the idea a few cling to, that uncalibrated brass can do better, is just absurd"
F. Guffey