I have 50 "Sport Ammo Corporation" mini shells that I bought in a lot auction 20 years ago. They are made of metal with the opening in the base fitting a .22 LR shell or a shotgun primer. They fit into the chamber of a 12 Gauge and are about an inch long. The sides are fluted. Any idea what these are, or what they were used for? They come 10 to a box. Thanks!
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