Winchester BIG BORE 357 Magnum 158 Grain Jacketed Hollow Point Brass Cased Pistol Ammo 20 Rounds. Specifications for Winchester Big Bore 357 Magnum 158 Grain Jacketed Hollow Point Brass Cased Pistol Ammunition: Manufacturer: Winchester Caliber: .357 Magnum Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 158 grain Cartridge Case Material: Brass Muzzle Velocity: 1460 ft/s Muzzle Energy: 1031 ft-lbs Application: Hunting Package Type: Box Primer Style: Centerfire Lead Free: No Features of Winchester BIG BORE 357 Magnum 158 Grain Jacketed Hollow Point Brass Cased Pistol Ammunition Deep Penetration - Semi-Jacketed Hollow Point Design controls and delays expansion. Optimized Expansion - Achieves massive shock and produces lethal wound channels. Reliable Performance - Dependable in critical personal defense and hunting situations. Package Contents: Winchester BIG BORE 357 Magnum 158 Grain Jacketed Hollow Point Brass Cased Pistol Ammunition Winchester X357MBB: BIG BORE 357 Magnum 158 Grain Jacketed Hollow Point Brass Cased Pistol Ammo 20 Rounds