This is .308 Hornady Superformance 165gr. SST Polymer Tip Ammo. Hornady Superformance ammo provides increased ballistic performance, and is safe to use in all firearms, including semi-autos, lever gun and pump actions. Increases in rifle performance, no increases in barrel wear and felt recoil, along with superior temperature stability are all realized with Hornady Superformance ammunition. This ammo is brass cased, boxer primed, and non-corrosive. This ammo is packed in 20rd. boxes. Muzzle Velocity 2840 fps.