Developed by Winchester Repeating Arms Company, the .270 Winchester caliber round came onto the scene in 1923 and was officially released in 1925. Also known as 6.9x64mm, the .270 Winchester delivers powerful performance. The post World War II era saw much of the .270 Winchester’s success, gaining much popularity with hunters and gun owners. Around the world, the .270 Winchester can be chambered in many firearms variety, including bolt-action, lever-action, single-shot, pump-action, autoloaders and even some double rifles.