I have a traditions Muzzle loader that is (or was) a 200 yrd tack driver. Got it back from a friend that borrowed it last year and the barrel was horribly rusted. Obviously not cleaned after being shot.
So, I brushed the hell out of it and soaked in oil. Was looking ok, so I left a oiled rag in it for the last month or so. Pulled it out and pulled the tag. Still has a crap load of surface rust in barrel. Rifling looks fine.
So the ultimate question. How much rust is too much to NOT shoot it?