ORIGINAL: Bernie P.
The .270 and 30-06 will always be among the best but IMO the .280 has the advantages over both.
Agreed! Even O'Connor admitted this fact! The only reason I can think of for the existence of the .270 is that Brenneke had already designed the 7X64mm before Winchester brought out the .270. IMO, Win. would have made theirs a 7mm also, if someone had not already beat them to the punch!
(There was a 6.9X57mm Chinese [Mauser??] cartridge that useda .277" bullet, like the 270 Win.. Maybe this oddball inspired Winchester. Who knows? Even COTW has no real info on this Chinese round, ca. late 19th Century/early 20th.)