Founded in Pittsburgh Pennsylvania, Peterson Cartridge strives to created not only quality brass casings, but the most precise and consistent casings on the market. Each casing is inspected to ensure that it meets the high quality control standards of Peterson Cartridge. This a Bulk Box (250) of .300 Winchester Magnum Unprimed Brass Casings Peterson Brass Peterson .300 Win Mag Casing Bulk Box of 250 PCC300WM250