To my thinking stopping the second proof shot if plastic deformation was seen on the first shot won't save anything. You can't make the barrels stronger and send them to be proofed again. will I guess you could send them to Teaque for lineing and then try to sell a new gun will lined tubes.No real difference in saying the barrels are junk because of plastic deformation or blowing them up on the second shot,barrels are realy trash either way.