Assuming you're talking about an AR-15 in .223 (16", 1-8" twist, 5R, probably a Smith and Wesson one at that), you can shoot any bullet that will fit into the magazine.
Actually, a 1-8" will stabilize the 75 and 80gr VLD bullets pretty well too. They have to be single loaded because they won't fit in the magazine and are pretty much a handloading-only proposition, but there it is.
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