I have a 66 yellowboy. i shoot triple 7 2f 30 grains by volumn in a 45 lc case 250 grain bullet with standard win large pistol primer.
when it comes time to clean i tear it down each time, but i dont take the bolt out.
i use a mixture of ballistal (about 15% ballistal, 85% water) and water in a spray bottle.
I remove side plates, take out carrier, spray the barrell down real well set aside to soak. spray the carrier down and the area the carrier goes in as well as the rest of the inside of the frame(only because its easier than not spraying the frame).
walk away and have a smoke. after smoke wipe down all parts. this balllistal/water mix cleans bp easy.
use a bore snake for the barrell, pull it through barrell 4 times.
if therer is still crud on the carrier after wiping it down. i cheat, i use a dremel and a brass brush to clean off the crud.
dremells are great.
now just put it back together while lubing it lightly with pure ballistal.
the day i shoot i will run a patch with bore butter down barrell(helps with fouling)
during the match i will spray the carrier with ballistal (in a aresol can) about 1/2 way through the match or when the carrier feels like its draggin.
yea i know these steps may be a pain to some and a lot of work. thats the price you pay for shooting black powder or the subs.
i shoot the bp because its so much fun to hide the targets from the counters and the RO/timer person.