FWIW I own a handgun and a shot gun but just for home defense...
Back in the day I had some mail order catalogs (dating myself) for old black powder firearms.
Maybe some day I will retire out to the country and have an assortment of rifles to play with.
IMHO black powder is like listening to vinyl... a lot of people appreciate the simple elegance of preserving the older things.
As an example most of us here love old cars when a new Hyundai can probably do everything better.