The .264 Warrior Magnum (also known as 6.5x40mm) is a 6.5 mm caliber intermediate cartridge that was developed specifically for long-range Benchrest shooting and hunting in AR-15 platform because it has a flatter trajectory and retains greater terminal energy at extended ranges than other AR-15 cartridges due to its higher ballistic coefficient. In Canada and the United States, it is used for taking deer and other medium-sized game.