that's sorta why the .280/7mm express/.280 again/whatever remington wants to call it next, never caught on real well. they moved the shoulder forward a little and it's real hard to reform '06 brass into it. whereas the .270 just takes one push on your reloader lever. remington said it was to keep folks from trying to chamber it in a .270, which makes some sense i guess, if illiterate folks who can't read own one. there is only .007" difference in the the bullet diameters. but i also read one time that some remington guy admitted that they did it for ammo sales as well. there's really nothing wrong with the .280, but it never made much sense to me to have 2 basically identical cartridges shooting bullets that are only 7 thousandths difference. wildcatters and balistics engineers are always trying to come up with the optimum cartridge. it's a good thing too, that way there is always something to argue about.