I shoot a lot of BP through my two premium USFA's and 3rd gen Colt with cross pinned frames. Just pull the cylinder, lube the base pin and bushing with BP grease. I grease over the first bullet in every group, when I remember to, just like a cap and ball pistol. I always smear a bit of lube on the frame below the cross pin as that keeps the powder fouling soft there for easy clean up. The nickel plated gun is easier to clean up then the silver plated or the blue gun. The 3 guns have tight cyliner to barell spacing and tend to want to hang up, but a cup of water poured on the gun frees up everything. I cast and load my own and have used different lubes and bullet styles. The latest bullet is the 250 gn Lyman with a large grease groove. My latest lube is essentially beeswax and Crisco.