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Using the dial caliper I just use the wide part against the flared mouth... .475" sounds about right for jacketed bullets... and turn the LFCD in until I get .470"-.472" ...more or less straight with the walls...no discernable taper at all.
You just want to remove the flare.
Consider getting a loaded case gauge and drop them in occasionally while loading. You will get the feel between a flared, slightly flared, straight mouth pretty easy. I like a clean fit, absolutely no resistance.
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