I have several front stuffer handguns that I hunt with!
.31---.32---.36---.44---.45---.50---.69 calibers.
One of the .44's is a smooth bore as is the .69(Flintlock)
The .44 smoothbore and a .44 plastic shot capsule
makes a pretty neat little shotgun.
The .31 "Baby Dragoon" is actually my favorite!
There is nothing like Rabbit hunting with a tiny blackpowder
revolver. As for loading black-powder into a cartridge gun,
Only my .45-70 rifle!