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I have a fairly recent Lyman #311041, and its casts 92/6/2 to a fat .311", a few ticks short of .312". In my experience, that would cast WW metal at .311" without much ado. My 30-30s (both Winchesters and Marlin MicroGrooves) do their best work with bullets sized at .310". FWIW, I pole-axed an idiot coyote with a Lyman #311041/cast as a soft-point a few months back. Muzzle velocity was about 1800 FPS, hit was made at 115 yards. DRT.