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I use the FCD on lead with nothing but good results. The taper crimp is just fine. Semi auto rifles need the crimp or adequate neck tension to keep the COL from changing from bullet movement. Before I crimped, some .223's would slide up and engage the rifling. I don't like mixed techniques, and though I have tried intentionally loading long like that for bolt guns and single loading, I don't approve of the method for semi-auto rifles. There is a real potential for disaster.
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