Cartridge Filler?

[Buffalo Bob]

What kinds of stuff do people use or recommend for the filler in a paper cartridge, between the black powder and the bullet, so that the cartridge fills up the chamber?

What are the reasons, advantages, disadvantages, etc., of each?

[snapcap14]

depending on how much filler you need. grits or cream of wheat. I have one gun that only needs th thickness of a felt wad.