I've done it once, can't remember the maker of the barrel, I just recall the caliber was a 38. I cut off the breach end rebreached it, but with cutting it the rear sight was going to be too far back, so indexed it so the bottom was up on top cause the dovetails from old barrel mounts worked out better as sight dovetails. I used it to make a child's rifle, ended up giving it away to a friends kid. I can remember seeing a bunch of those Italian barrels all messed up a long time ago, I'm guessing that the owners had a stuck ball they couldn't get out so tried the pull the breach plug without first removing the drum( not to many flintlocks back then), seemed like all these barrels were damaged the same way. The gunsmith I knew replaced a lot of barrels.