Sir, thank you so much for this link! I am not into revolver BP (muzzle loading) yet, trying to learn as much as possible. From what I found, this is the most comprehensive manual about shooting these revolvers.
I always felt that sharp edges on chambers is not the best solution, and slight chamfering them is the way to go. I was especially concerned about chain fire, and was presently surprised that chamfering is effective way to (almost) eliminate chain fire. On top of that, chamfering improves accuracy, and even reduces ramming force when seating bullet.
Author does not recommend cleaning revolvers with warm water and soap. Also, he states that lube in front of bullet helps nothing, but rather makes things worse regarding chain fire, creating mess by spreading lube everywhere, making revolver slippery and difficult to handle.