The .270 Winchester (or 6.9x64mm) was developed by Winchester Repeating Arms Company in 1923 and unveiled in 1925 as a chambering for their bolt-action Model 54. The cartridge is a necked down .30-03.
When loaded with a bullet that expands rapidly or fragments in tissue, this cartridge delivers devastating terminal performance.
The .270 Winchester became a very popular deer and elk cartridge due to the widespread praises of gun writer Jack O’Connor who used the cartridge for 40 years and espoused its merits in the pages of Outdoor Life. It drives an 8.4 grams (130 gr) bullet at approximately 960 m/s (3,140 ft/s), later reduced to 930 m/s (3,060 ft/s). The cartridge demonstrated high performance at the time of its introduction and was marketed as being suitable for big game shooting in the 370 to 910 metres (400 to 1,000 yd) range. Two additional bullet weights were soon introduced: a 6.5 grams (100 gr) hollow-point bullet for varmint shooting, and a 9.7 grams (150 gr) bullet for larger deer, elk and moose in big-game hunting.
While not an immediate success, over the succeeding decades and especially in the post-World War II period, the .270 Winchester attained great popularity among gun owners and hunters, ranking it among the most popular and widely used cartridges worldwide. Internationally, firearms manufacturers now offer this chambering in all firearm varieties: bolt-actions, single-shots, lever-actions (such as Browning BLR), pump-actions (such as Remington 7600), auto loaders (such as Remington 7400) and even a few double rifles.