Ah, this answers some questions - my Beretta PX4 Storm 40 slugs out at .402, .002 over nominal. It leads badly with slugs sized at .401, and has so-so accuracy with factory jacketed .400 bullets. I am hoping to try some Berrys' plated .401 bullets.
Having said that, my Lee mold actually drops at .404, so I have tester rounds loaded with the wider dimension bullets waiting for range time. I am looking forward to hopefully some improved results.
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