Are you reloading for your Beautiful Trapdoor Dan? I don't think there is a firearm that is easier to clean after shooting Blackpowder. If you use a bullet with Blackpowder lube (VERY IMPORTANT) the fouling comes out of the barrel very easily, and the breech face is very accessible to clean what little fouling is there. Sidelock, so no fouling in the action! A little added work dealing with the cartridge cases, but worth the effort. If you insist on a Blackpowder substitute Blackhorn 209 may be worth trying, it worked really well for me in a 45 60 Craperell that hates Real Black. It is really expensive though, at about $45-$50 for 10 ounces!
B.N.Scotty