I'm also posting this in the black powder section because it involves loading a black powder cartridge like the .45-70 with real black powder or a sub like Pyrodex.
I understand when using black powder that you must fill the gap between the powder and bullet with a filler (correct me if I'm wrong). If so, what kind of filler does one use? I've read some use oatmeal. Also, is it necessary to use a drop tube for the powder and is the powder measured by volume same as a muzzy?