So this last spring a friend gifted me an old Remington 700 muzzleloader he had bought used but never shot. When I received it, it was spray painted with slight surface rust, but the bore looked good. After cleaning the bore with bore tech and stripping the spray paint and then Duracoating properly; I ran a wet patch with lucas oil through the barrel and put it away for the summer. Fast forward till now, and I pulled the gun out, ran a swab through the barrel, and behold.....rust. Started to clean the bore with wd40 to remove any rust, but patches kept coming out black. Decided to start soaking the barrel with clp and scrubbing the barrel with a brass brush and dry patch and then resoak in clp. Been doing this for a week and still having patches coming out black........has anyone ever had a muzzleloader this dirty? Is lucas gun oil so thin it could really dry out in under 6mnths? Or is the cause of the rust because boretech has no affect of blackpowder residue?