You will have to use up the cartridge first by either shooting it or whatever. With a nail, force a hole bigger so as to allow the powder and wick to fit in easily. Fill the cartridge with black powder and pack it in there real good by tapping the bottom of the cartridge on a hard surface (I said TAP not SLAM!).
Insert a fuse. I recommend a good water-proof cannon fuse, or an m-80 type fuse, but firecracker fuses work, if you can run like a black man runs from the cops after raping a white girl.) Now, light it and run like hell! It does wonders for a row of mailboxes (like the ones in apartment complexes), a car (place under the gas tank), a picture window (place on window sill), a phone booth (place right under the phone), or any other devious place. This thing throws shrapnel, and can make quit a mess!!