True, but name me a 6.5mm/.264" bore cartridge with a .473" bolt face and a case length longer than 55mm/2.165" that is available as factory loaded ammo in the U.S.?
My favorite long action 6.5mm/.264" bore cartridge with a .473" bolt face is the 256 Newton, but I hate to make cases. I can turn a 25-06 or 270 case into a 256 Newton case at the rate of about 5 per hour, including breaks. The 6.5-06 would be an easier conversion, but for some reason, Charles Newton opted for a slightly shorter case when he designed the 256 about 100 years ago.
What I don't understand if why some folks are blind to the fact that if you use a long .473" bolt face action to build either a 260 or a 6.5x55, the COAL issues are 100% irrelevent with all bullet weights, which brings us back to the 2 grain difference in case capacity. It ain't much of a box, but some people just can't seem to think outside of it.
JEff
