Just use a primed case, no powder. I have some rubber 45 cal practice bullets that are made like a skirted pellet for airguns. I used an old surplus blanket hung over a dowell rod with a target taped to it. A regular LP primer will put that rubber pellet through at least 6 free-hanging layers of that blanket at 25 ft.
ETA: The practice bullets were bought from Gil Hebard back in the mid-80's and shot from a Detonics combat master with a 3.25" bbl. Prime the case and stick the bullet in the case flush with the mouth.
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