NO NO NO NO NO NO NO NO NO
DO NO TRY THIS.
45 GAP has a much thicker web and a different extractor groove around the rim. You will blow up your gun by doing this. 45 ACP is a large primer case and thus further "weakening" the case head leading to a potential KA BOOM. Never cheap out on reloading components saving $0.10 for a piece of brass is not worth a $500 dollar gun or your health.
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