What Homers said....
The .280 Rem was the .280 Rem until 1979..Then it was BRIEFLY stamped as the 7mm Rem Express ( because of Rem's success with the the 7mm Rem Mag).. Then it soon became the .280 Rem again..
It's a fine cartridge, and I have killed everything from woodchucks to 1500 lb. Alaska bull moose with mine, at ranges from point blank to 400 yards..
Of course, I could have done the same thing with a .270, with proper bullets..