This is .308 Win. Right To Bear Subsonic 220gr. Open Tip Match Ammo. This new ammo is brass cased, boxer primed and 100% non-corrosive. Does not cycle in semi-auto. Muzzle velocity 990fps. This ammo is made in the USA, manufactured by Right to Bear Ammo, a federally licensed manufacturer of ammunition. It is packed 20rds. per box.