`  :I can't speak to your statements necessarily as much of what you say is self-research.  I can only say that I got the info from the Lyman Reloading Hanbook, 48th edition (this is the book I get all the cartridge dimensions from).  The dimensions listed in that book show a bullet diameter of .452`` IIRC.  I don't have the book handy at the moment, but I will recheck in the AM.  Coincidently, this reference book also has groove-diameter info.  I'll check it and post here tomorrow with what I find. —  |  `