I have found that most of the replica black powder firearms take the #11 cap. One thing that I would recommend if you haven't shot a black powder revolver is to buy some Ox Yoke wonder wads to go over the powder. If you use them then you don't have to grease the cylinder openings to prevent a chain fire.
Want a quick and inexpensive call for Moose? Take an empty 32 ounce coffee can, and make a small slit in the bottom, only about a quarter inch. Then, take one of those really big red rubber bands, the ones that go around big folders. Cut the rubber band to make one long piece.
Now, thread one end of the band and tie a knot on the outside of the can so it won't pull through. Cut the band off on the other side so it is even with the top of the can.
Now, wet your finger,...