The combinations are endless to catch the unwary out. One that catches many out is 20 gauge in a 12 gauge drops into front of chamber and 12 gauge behind it blows gun.Old pig hunters used 303's in 410 shotgun as a bail gun with not much drama.Obviously expands and pressure is low. Somebody fired a 7.62x39 in a 7x57 recently,not a good idea.
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