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Not a good idea shooting cast out of an AR if it's your intention. Plugs up the gas system.
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Why would it be any worse than using a .22 conversion in your AR? I do that without problems. I do shoot some 223 ammo when finished to clear the gas system.
I just checked my Lyman Cast Bullet manual (3'rd edition) and lots of loads are listed for 223. Test weapon was a mini 14. PM me if you would like the load data and don't have access.