Wasn't the 265 grain Hornady, the daddy of the "heavier" bullets in .44 Mag., .430 whereas most of the others measured .001 or .002" less? Seems like it was developed specifically for the carbines, like the Marlin1894.
My understanding is that bullet was made primarily for the 444 Marlin with secondary use in the 44 Magnum.
Most Hornady jacketed bullets run .430, whereas Speer and Sierra and Nosler are .429-.4295, regardless of weight.
