Oh it doesn't take all that much to blow damascus barrels, even Remingtons. I did it. Reloaded some shells with IMR PB and thought it was Pyrodex. Blew at the chamber, fourth shot. Had em tested later after I got stiched up - 19,900psi. I still shoot damascus barrel SxSs with both smoke, and smokeless. Will admit, I'm REAL carefull what goes in them. Paul