The British Army had already opted in 1913 for a 7mm cartridge with a performance level not much different from the 7mm Remington Magnum. The advent of World War I shelved the project and turned the P13 Enfield in caliber .276 to the P14 Enfield in caliber .303, and eventually into the M1917 Enfield in caliber .30-'06, which explains why the P14/M1917 Enfield action was too heavy and too large for the two cartridges it was later adapted to.

An interesting article on reviving the P13 Enfield can be found at http://www.milsurps.com/showthread.php?t=4096