Every new rifle I get wether it be a reg rifle or muzzleloader,I give it a 200 stroke treatment of JB bore cleaner.Depending on how much I shoot it through out the year I give it one or two cleanings with 50 strokes.As for oiling afterards I like to use a gun oil with telphon,If I am going to be useing it soon I run a couple patches through to dry it out,If its going to sit awhile I don't dry it out.This is exta cleaning,after each range session I clean each rifle with 50 bmg.
The directions are on the jar of JB of you want to go this route.