BP is a hoot to shoot. Try your best to get the "real" black powder though rather than the pyrodex. Only for the old world effect of the huge cloud of smoke you'll get. I'm fortunate that a store in Macon carries the stuff.
I got the bug years ago and have 4 in my collection. No inlines cause I don't personally think they qualify as real BP guns.
.50 Cal Hawkins
.58 Cal Enfield Musket
2 x Remington revolvers (copies) in .45 caliber