How big are they?
Miner tags. I've found quite a few of them over the years, I have a baggie full of different ones. I've read they served different purposes at the under ground mines. One was to put on a board to check in and out of the mine to ensure everyone made it out of the mine. Another was to check out tools so they knew who had them. And another I read was they put them on the carts of coal they sent up so the people up top knew the miner that sent the loaded cart. Most of them date between the 20's and 40's I believe.
1-1/8" diameter.
If those tags are really from South Jersey then I doubt that they are miner tags. The .22 cartridge is interesting. As a kid I remember seeing what were called .22 shot loads at a local rod & gun club that had crimps like that. Alternatively they might be old impact driver .22 charges for setting nails in concrete. Might it have been a cartridge for a starter pistol for track events? In the picture it appears like it may have a crimp on the base as though it was fired. A dud?
Rock Jock got it, it’s either from a starter pistol or a Ramset for putting nails into concrete. The shot shells you mentioned look like a regular 22 round except instead of a single bullet on the end it has a small plastic capsule filled with tiny bb’s, like a mini shotgun shell. Very short affective range on them though.
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Thanks for the suggestions! Over the weekend I found a small 22 bullet casing on the over side of the house.