Years ago my old friend Oscar Gaddy with the help of a noted authority did failure tests on a Parker Damascus gun. Long story short it went to 30,000 psi before it blew! These tests were covered extensively in Double Gun journal and lead to todays expanded us of old Damascus guns. I wish my old memory could pull the main author's name up because he did far more than a Parker and in fact di some real junk guns with safe results.
Dig out the articles and be surprised.
bill