I believe the .280 was originally designated as such. I bought a brand new one, a 725 Rem. which I still own, in 1963. It is stamped as "280 Rem.". Some years later, it was redesignated as 7mm Rem. Express, in an effort to follow market directions, and increase sales. Later, the designation was changed back to "280 Rem". It's enough to befuddle a professor. Anyhow, they are a tremendous round, and I think the original intent was to give Remington a cartridge to compete with Winchester's (read Jack O'Conner's) .270. It did so woth minor acceptance at first, but has come to be a very well-respected round.