Halsey is a city in Linn County, Oregon, United States. The population was 904 at the 2010 census.

The .500 Bushwhacker is a .50 caliber semi-rimmed revolver cartridge developed by TII Armory for the Magnum Research BFR revolvers. It is currently the most powerful revolver cartridge in the world, offering a similar level of ballistic performance to African stopping rifles, such as the .416 Rigby and .470 Nitro Express. Given comparable barrel lengths, it is nearly twice as powerful as the .500 S&W Magnum. A 10-inch barrel revolver chambered in the cartridge is capable of penetrating 96-inches of 10% Clear Ballistics gel.