On the topic of crazy, in the Birmingham Proof House Trial reported in 1891, the five barrels tied in the 2nd Phase failed at 12.5 times the Definitive Proof load or
11.34 Drams with 2.82 oz. shot. That is in the range of
140,000 psi
The Trial is reviewed about 1/3 down here
https://docs.google.com/document/d/1...EK8OtPYVA/edit