Optimal jacket wall thickness controls expansion and retains weight open pocket under the polymer tip expands lead core instantly on impact tuned ogive for industry leading BC boat tail design for stable flight and accuracy. Introducing the Sierra GameChanger hunting bullet, the perfect combination of Sierra's legendary match accuracy coupled with deadly penetration. Sierra re-engineered their legendary MatchKing bullet into a hollow point design for quick expansion and fitted it with a transparent green tip for ballistic uniformity. Inside, the GameChanger features a unique construction that utilizes a special lead alloy surrounded by a tough copper jacket that delivers excellent penetration and expansion at a variety of ranges. It's a GameChanger on any hunt. This is not loaded ammunition. This bullet requires a barrel twist rate of 1 x 8 inches or faster (4330).