Jacketed bullets are fine. As stated above the poly rifling doesn't take well to lead. Most of my handguns have never seen a factory round. I don't shoot cast in my Glocks. I don't shoot jacketed in my 1911 target pistols. My choice
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As a note for anyone that has a problem with this, either adjust your sizing die down all the way or buy a small base die. My Dillon has seen close untold thousands of 9mm rounds and I've never had an issue with Glocks, Berettas, Sigs, 1911s and a few others. The trick is properly adjusting and testing the casings.