Tried to find out how they accurately measure stress that causes spring back. The accurate methods require neutron bombardment or an xray method. Page 94 of the below article gives a simple method. You would cut the neck off of a case and some how accurately cut a sllit lengthwise across the entire neck. Then you measure the change in the gap width. You don’t get stress values but the amount change. It would ruin the case but it would be interesting just to see how much just one case sprung open or closed. Maybe a fired and sized case a fired and annealed case. Don’t know what you would learn from it, but it would be interesting to do once. It might be surprizing how much the gap changes.
Article by the International Atomic Energy Agency
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