I put it in storage....should have tried a 22 live round in it ....anyway...we have all something to share about coins with holes ....and lot's of memories ...WV62 ...what an experience he had !No way to measure the hole in the penny? A pointed 22 pellet with enough pumps (or charge) would make a neater hole than a round nosed 22 bullet. We used to hit the old non aluminum beer cans with pellets and they didnt roll around as much as 22 RN lead or copper coats. Just a thought.