doc06 Sherman Bell has done a lot of pressure testing on BP loads, there is probably some info in his articles in DGJ on service loads. From 1968 to 1979 Gun Digest had a series of articles on gun proof, there must be some info there on proof pressures, I have the articles, I will check and let you know what issue(s)

I learn something every day, and a lot of times it's that what I learned the day before was wrong