[aa1911]

I've used T/C's bore butter for two decades now, works like a charm. Not as important as what you use (within reason of course), but rather that you just take regular care each time you shoot.

I still have a lard can almost full of bear grease from a buddy's bear years ago, used that for patch lube for a while also. Just rendered down bear fat, lots of uses in the black powder arena.

SBGO is a favorite around here though too, can't go wrong with that.