Winchester Super-X RIFLE .300 Winchester Short Magnum 180 grain Power-Point Brass Cased Centerfire Rifle Ammo 20 Rounds. Specifications for Winchester Super-X Rifle .300 Winchester Short Magnum 180 grain Power-Point Brass Cased Centerfire Rifle Ammunition: Manufacturer: Winchester Caliber: .300 Winchester Short Magnum Number of Rounds: 20 Bullet Type: Soft Point (SP) Bullet Weight: 180 grain Cartridge Case Material: Brass Muzzle Velocity: 2790 ft/s 2970 ft/s Muzzle Energy: 3526 ft-lbs Application: Big Game Package Type: Box Primer Style: Centerfire Lead Free: No Gun Type: Rifle Features of Winchester SUPER-X RIFLE .300 Winchester Short Magnum 180 grain Power-Point Brass Cased Centerfire Rifle Ammunition: Power-Point Assures quick and massive knock-down Strategic Notching Provides consistent and reliable expansion Contoured JacketMaximum expansion performance Alloyed Lead Core Increases retained weight for deeper penetration Package Contents: Winchester SUPER-X RIFLE .300 Winchester Short Magnum 180 grain Power-Point Brass Cased Centerfire Rifle Ammunition What is Winchester Super-X Rifle .300 Winchester Short Magnum 180 grain Power-Point Brass Cased Centerfire Rifle Ammunition good for? The manufacturer suggests that it is good for big game.Winchester SUPER-X RIFLE .300 Winchester Short Magnum 180 grain Power-Point Brass Cased Centerfire Rifle Ammo 20 Rounds X300WSM