The Winchester Super-X Power Max Bonded Centerfire Rifle Ammunition is a lead bullet enveloped with copper alloy and ideal for whitetail hunting. The two elements work together for better expansion and deeper penetration while maintaining a light weight. The lead content remains fused with the copper alloy jacket even after contact to the target. Super Max Centerfire is available in different varieties depending on your desired caliber and bullet mass. With the maximum expansion this is highly recommended for whitetail hunters who are aiming for a stronger shot and quicker takedown.