Sierra GameChanger Features Sierra s GameChanger ammunition is the result of more than 70 years of designing world-class bullets. Each GameChanger round utilizes a Sierra Tipped GameKing bullet with an extremely accurate boat tail profile and a polymer tip seated in a hollow point design for fast expansion upon impact. A lead core encased in a thick tough copper jacket delivers outstanding penetration and controlled expansion at any range. Sierra GameChanger Specifications Brand: Sierra Category: Centerfire Rifle Rounds Caliber: 7mm Rem Mag Model: GameChanger Rounds Per Box: 20 Casing Material: Brass Bullet Type: Tipped GameKing Bullet Weight: 150 gr