ME! ME! It's worth noting that calibre by dictionary definition is the internal diameter of the barrel. British and Continental practice is to measure across the lands, American across the grooves. The trend now is to cite external diameter of the bullet. .308 is the same caliber as NATO 7.62, and .22 WRM,.22 Hornet, .222, .223, 22-250, .220 Swift and 5.56 all fire the same diameter bullet, standardised at .224". Chamberings of course are different in each case, except 5.56 and .223. Then .243, 6mm, .240 Weatherby all fire the same diameter bullet. Confusion worse confounded now I fear, becaus