This is .300 WSM Winchester Supreme 150gr Nosler E-Tip Ammo. Gilding metal lead free design coupled with a Lubalox coating to reduce engraving and barrel fouling. Polycarbonate tip resists deformation and improves downrange ballistics and promotes consistent expansion. This ammo is nickel plated brass cased, boxer primed, non-magnetic and 100% non-corrosive. This ammo is packed in 20rd. boxes.