I usually shoot black powder in my hammer gun. I will wipe the action and firing pins. Fortnately the locks are isolated from the firing pins. With my modern box lock guns I will disassemble and check them ocationally.
I really have not had much blow back into the firing pin holes, the breach face is usually just slooty and cleans up with warm soapy water on a damp rag.
The barrels are another story, I am from the old muzzleloading school, so it is hot soapy water and a bucket.
As regards an earlier comment, when I am shooting more than a round or two of skeet, I use a spray bottle of soapy water to keep the fouling soft. It looks funny with a spray bottle hanging from you back pocket but it works. 100 rounds of black powder can really coke up a barrel.
I think black powder is either an interesting experiment or a mind set. I am addicted to the the smoke and stink so the clean up hassle is just part of the game.
Good luck
RPr
