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I read an article several years ago about someone doing this with .44 Spl cases. He used #9 shot, and I did likewise (but with .45LC).

He took a case, took a triangular jeweler's file and made "teeth" in the case mouth, then used the case to cut wads from a styrofoam egg carton. One over the powder, another over the shot. Seal with wax, glue stick or Super Glue.

Worked pretty well for testing purposes; fortunately have not had occasion to use on a snake.