I took apart my .38/.357 decapping die just to clean it out…and found this!
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The .22 LR cartridge case must have nested in a .38 or .357 case and got centerpunched by the decapping pin. I have no idea how it stayed in place, between tumbling, separating the cases from the media, case sorting, tossing into the case hopper, etc. Since I last cleaned the die out about two years ago, I don’t know how long it has been there or how many cases I have resized with it stuck on there.
It fit so snugly on the stem that I had to use pliers to twist it off.
Stay safe.