Shoot a box of Remington Core-Lokt .338 Winchester Magnum 225 Grain Centerfire Rifle Ammo to see why it has remained the leader in hunting ammunition for more than six decades. Core-Lokt ammo uses one of the most effective hunting bullets ever developed - the original controlled-expansion bullet design. A progressively tapered copper jacket is locked to a solid lead core to promote a perfectly controlled expansion and high weight retention after impact. Remington Core-Lokt .338 Winchester Magnum 225 Grain Centerfire Rifle Ammo uses only premium brass cases, primers, and powders that you can rely on in any hunting environment. Proven big game hunting ammunition The original controlled-expansion bullet design Progressively tapered copper jacket Jacket locked to a solid lead core Controlled expansion and high weight retention Premium brass cases, primers, and powders