I'm using the 220gr FP .401 SNS. Coated. Mine are measuring at .4005 to .401. I use a Lee turret press and Lee dies. My finished round measures .416 near the base and .420 near the top. My factory hydroshocks are measuring .418 at the top. Mine plunk and work fine in my factory G20 barrel. I'm loading these as soft as I can get away with.