Winchester Deer Season XP Copper Impact .300 Winchester Short Magnum 180 Grain Copper Solid 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 180 Grain Copper Solid Centerfire Rifle Ammunition: Manufacturer: Winchester Caliber: .300 Winchester Short Magnum Number of Rounds: 20 Bullet Type: Polymer Tipped Boat Tail (PTBT) Bullet Weight: 180 grain Cartridge Case Material: Brass Muzzle Velocity: 2576 ft/s 2810 ft/s Application: Deer Personal Defense Package Type: Box Primer Style: Centerfire Lead Free: Yes Bullet Core Material: Copper Package Contents: Winchester Deer Season XP Copper Impact .300 Winchester Short Magnum 180 Grain Copper Solid Centerfire Rifle Ammunition What is Winchester Deer Season XP Copper Impact .300 Winchester Short Magnum 180 Grain Copper Solid Centerfire Rifle Ammunition good for? The manufacturer suggests that it is good for personal defense deer.Winchester X300SCLF2: Deer Season XP Copper Impact .300 Winchester Short Magnum 180 Grain Copper Solid Centerfire Rifle Ammo 20 Rounds