This is .35 Whelen Buffalo Bore 225gr. Barnes Triple Shock-X Lead Free Ammo. If you need the deepest possible penetration from an expanding bullet in .35 Whelen, the 225gr. Barnes TSX bullet delivers. It will out penetrate a 250gr. typical premium partition bullet, but gives the advantage of higher velocity, flatter trajectory and reduced recoil of the lighter 225gr. bullet. You can use this TSX load for bad angle (quartering or going straight away) shots on the largest North American big game. This ammo is designed to be the highest quality, most powerful/versatile, .35 Whelen ammo in the world. It exhibits sub MOA accuracy in Buffalo Bore's test rifle. Muzzle velocity of 2800fps. This ammo is packed in 20rd boxes.