So my father in law recieved these two muzzleloaders from a man he worked with. Neither had been fired in years and one is in awful non firing condition. The other one however has a very nice barrelno surface damage or rust and the synthetics are in very good shape with no scratches or nicks. Problem is that he put it away with powder in it and now I cant remove the breach plug to clean it out. I have tried everything any suggestions?