I have read of using cornmeal or Cream of Wheat as a filler in underloaded black powder guns. I don't do it, but then I am a rifle shooter and need all the speed I can get.
Lee makes moulds for the Pigeon Roost Slim bullets with huge lube grooves for extended shooting in black powder repeaters. Maybe Hawg has a comment there.
While wheelweight lead is not usually recommended for bp bullets, I am using Montana Custom Casting bullets made out of wheelweights + 2% tin and they seem to shoot as well as what I used to cast out of straight 20:1.
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