My friend Kate did something similar with a twelve gauge shell, a bench vise and a ball peen hammer. The hammer came back with significant force and actually dented her 10 year old forehead. A scar she bears to this day. I’ve often told her I wouldn’t have expected the hammer could dent her hard head but there it is…As a kid , my Mom would send me outside into my Dad's garage workshop to keep from under foot. Early on , I found an old tin of Percussion caps marked EALY ?.. Coulda' been pre WW 1. I told My Dad I found them and he said they were old and dangerous , and not for kids. I waited until he was at the coal mine working , ok , got one of the "caps" out , placed it on his anvil , smacked it good w/ a four lb. ball peen hammer. Found that the cap fired so well , it buried itself in my left forearm. Extracted the spent Ealy cap from my arm w/ Dad's needle nose pliers , and dumped a dose of burny coal mine first aid iodine on the wound. Never told Mom or Dad what I had done , 'cause I was told not to mess w/ stuff that was dangerous. A guy has ta find his limitations.
I still have a few boxes of those in my stash.Ely from England made superior .22 l.r. cartridges we used for rifle club in high school so it is probably same company that made your caps.
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