I have done this using black powder 12 ga. loads. But only use the cup portion of the wad. Filler is hard card and fiber with the shot cup placed on the fiber filler. It does work but I would not use the cushion part of the wad as I'd be very leery of the filler jamming into the shirt of the plastic cushion and causing pressure problems. I cut the cup off with a sharp utility knife of a razor saw. Just use the cup.
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