In my illspent youth, my father made a similar tool. He used some heavy gauge copper wire found someplace, and a 22 short case. He filed the case down until it threw 1 gr of Bullseye. We used it in his old 32 Regulation Police revolver. With a primer pushed out with a ground down nail, then a new one hand seated with a hardwood block and a dowel, we were set. The 1 gr powder charge was pretty light, and the projectile was a single OO buck pellet. We shot at maybe 20 feet at our bullet trap. Accuracy wasn't bad, probably better than I could hold in my pre-teen years.

Brings back memories.

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Dick Burg