I'd never heard of this happening before, but I was only about 5 feet away when it took place at a match yesterday. Two people were talking while one loaded an AR mag. The guy loading fumbled a round and dropped it on the ground, where is landed primer-first on a pebble and detonated. There was a nice loud POP like a firecracker, and a bit of smoke, and everyone around immediately turned to see what had happened - I was fully expecting to see someone holding a gun and white-faced. Well, there were no guns being handled, and there on the ground was the back 2/3 of a .223 casing, clearly blown in half. Yow!
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