Winchester Deer Season XP Copper Impact .300 Winchester Short Magnum 150 Grain Copper Extreme Point Centerfire Rifle Ammo 20 Rounds. The Copper Extreme Point bullet is a solid copper expanding projectile with an oversized impact diameter. A bigger impact diameter means more impact trauma better energy transfer and larger wound cavities for faster knockdown. Specifications for Winchester Deer Season XP Copper Impact .300 Winchester Short Magnum 150 Grain Copper Extreme Point Centerfire Rifle Ammunition: Manufacturer: Winchester Caliber: .300 Winchester Short Magnum Number of Rounds: 20 Bullet Type: Copper Extreme Point Polymer Tip (CEPPT) Bullet Weight: 150 grain Cartridge Case Material: Brass Muzzle Velocity: 3200 ft/s Muzzle Energy: 3410 ft-lbs Application: Deer Package Type: Box Primer Style: Centerfire Lead Free: No Features of Winchester Deer Season XP Copper Impact .300 WSM 150gr. Extreme Point Rifle Ammo - 20 Rounds: Large Diameter Polymer Tip Accelerates expansion resulting in rapid impact trauma Ballistic Profile Streamlined profile for flat trajectory and energy retention Tapered Jacket Engineered for lethal penetration on deer Alloyed Lead Core Optimized for maximum energy transfer and impact power Package Contents: Winchester Deer Season XP Copper Impact .300 Winchester Short Magnum 150 Grain Copper Extreme Point Centerfire Rifle Ammunition What is Winchester Deer Season XP Copper Impact .300 Winchester Short Magnum 150 Grain Copper Extreme Point Centerfire Rifle Ammunition good for? The manufacturer thinks that it is good for deer.Winchester X300SCLF: Deer Season XP Copper Impact .300 Winchester Short Magnum 150 Grain Copper Extreme Point Centerfire Rifle Ammo 20 Rounds