You guys have it all wrong. The White rifles work the way they do because Doc White is up there in Utah over a pot of boiling bat wings and stuff waving a magic wand over all the rifles before they get shipped. That is the only explanation that makes any sense when you see how the White rifles shoot. I am just glad I finally got my hands on one, I sure wish someone with money would bail out the company so that they could continue making the great rifles. By the way there is no "standard" bore size. My Omega measures .500 exactly with some variation down the bore. My NEF measures .503 with a pretty smooth bore with no noticable variations, My 91 White measures .504 with no variation for the full length of the barrel. White does make a bullet for the .500 diameter barrels as well as for the standard .504 White rifles. I have some to try in my Omega when I get the time.