RE: Fouling a bore
roundball shooters seem more incline to shoot on a clean barrel into the same group then the inline and sabot loads. Why.. no idea. When I shoot an inline I like to take 40 grains of powder and put a wad on that and pop that off out the patio door.
I have done as Sabotloader and fired the round off, then just swabbed the barrel "clean" if you can call it that. Then in the morning I can load it without shooting it, and go hunting again. Also I do oil the barrel at night and then swab that all out before loading the next day.