Definitions for ".280 Remington"
The .280 Remington, also known as the 7 mm Express Remington, was introduced in 1957 for the Remington model 740, 760, 721 and 725 rifles. The .280 is based on the .30-06 Springfield necked down to accept 7 mm (.284") bullets, with the neck moved forward .050". Having been released 32 years after the.270 Winchester and having no particular advantage over it's predecessor, it had somewhat unspectacular sales; Remington renamed the cartridge in 1979, calling it the 7 mm Express.