A summary of Bell/Armbrust's attempt to blow up vintage pattern welded barrels using Remington Proof Loads of 18,560 psi is at the bottom here
https://docs.google.com/document/d/1...hIiY62Hx4/edit
A total 28 vintage doubles/54 Twist and Damascus barrels + 2 Vulcan (Fluid) Steel were remarkably difficult to destroy.