I plan to start turning my .45 barrel blanks this weekend, for the .450#2 NE double which I'm building. I'm very interested in hearing from anybody with a .450 NE, .450#2 NE, .465-500 NE, .470 NE, or similar Nitro Express double rifle calibres, as to what the outside diameter of your barrels is at the muzzle and at the midpoint.