If you are going to shoot it, I highly recommend you have an experienced muzzleloader gunsmith remove the breechplugs and clean up around the flash holes and blowout plugs as well as scrub out the barrels, especially the powder chambers and the area just in front of them. You can never tell what unwanted material has built up in these areas. I would also replace the nipples to insure a good fit for modern caps. I like to use an extremely thin steel wire to make sure the hole in the blowout plugs is clean, but only the experts here can tell you if this is necessary.