In 1925 Winchester introduced a .30-06 case necked down to a bullet diameter which until then never had been used any British or other European manufacturer: .277″. The result was to become one of the most popular hunting cartridges in the world. When introduced it offered better long range performance than any other available big game cartridge. It was the favorite of the late gunwriter Jack Oâ€™Connor who through his writing popularized the .270 everywhere in the English speaking parts of the world. In Europe it also became widely used, but met heavy competition from the many popular 6,5mm cartridges and especially the 7×64 Brenneke. Over here it was never called by its metric designation – 6,9×64 – but kept its American name of .270 Winchester.\n\nThe success of the .270 was undoubtedly partly due to fact that it has a combination of a flat trajectory and a very manageable recoil with the standard 130 grain bullet. At normal hunting ranges a well placed bullet from a .270 means instant death to all species up to the size of mule deer, and many hunters prefer it for mountain hunting as respectable muzzle velocities and equivalent trajectories can be had from a 22″ or even a 20″ barrel.