Yep, the .280 Remington is a necked down 30-06 with a pressure limit of 50,000 cup and the shoulder moved forward so it couldn�t be chambered in a .270 Winchester.
The .280 was set at this lower pressure because it was 50,000 introduced in Remington�s semi-automatic and pump-action rifles of the 1950�s, which were not designed for higher pressure.
In 1979 Remington introduced the 7mm Express in bolt-action rifles only, (I have a 7mm Express) and this round as has a working pressure of 52,000 cup 2,000 cup more than the .280. I have a Remington reloading manual from 1980 and it lists both the 7mm Express and the .280 and shows the difference in max working pressure as listed above. Dimensionally they are the identical and if used in old autoloaders the lower pressure load of the .280 should be used, but in modern bolt action and semi-auto rifles 52,000 cup or so, the pressure design of the 7mm Express and could be used. The 7mm Express and new .280 are being condemned to the lower pressure of the 1950�s .280 pressure loads which I see in most reloading manuals in the 48,000 cup range and this cheats the 7mm Express owners and .280 bolt action rifle owners out of the potential of this excellent cartridge.
Thanks.
