Are you wanting to use this for black powder deer hunting? You could alway get some of the reloadable brass shells that the cowboy shooters use. They are made for black powder and you can load them up
with buckshot, slugs, etc...they just use an overcard so you could load them up any way you wanted.
I'd check with your state game dept to see if it would be legal. But you would be using a single shot weapon with a black powder charge from a gun that was designed in the late 1800's.
Heck, I might try that for bird hunting....<G>
Tom