Yikes! This is a first! And a good reminder to always check the inside of any unknown brass!Somehow a 22Lr ended up inside the 7.62 brass.
Ha, you reminded me that, when I was a kid, I used to pull the bullets out of 22lrs and crimp the casing and whack them with a hammer. Oddly enough no one ever stopped me. It really wasn't until powder bits got me in the leg that I stopped myself. The smart s#@t was never any fun.
I think it was actually my dad taught me to stick a kitchen match in a spent 22 case and smash it with a hammer, match stick becomes a projectile.Kids use to line up 22s on the rail road tracks. Also put coins on rails and trains would flatted them like paper. I don’t actually know what it did to 22s. There would be only millisecond from detonation to complete flattening.