The .270 Winchester is an American hunting cartridge developed by Winchester Repeating Arms Company and released in 1925 with the Winchester Model 54. Its parent case is the .30-03 Government, which is also the parent for other rounds such as the .280 and .30-06. It’s popular today for North America’s medium game and some large game, including whitetail deer. It’s seen more use in the West, where the range of the .270 Win can be fully utilized.