Winchester Super-X Handgun .357 Magnum 145 grain Silvertip Jacketed Hollow Point Centerfire Pistol Ammo 20 Rounds. Specifications for Winchester Super-X Handgun .357 Magnum 145 grain Silvertip Jacketed Hollow Point Centerfire Pistol Ammunition: Manufacturer: Winchester Caliber: .357 Magnum Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 145 grain Cartridge Case Material: Brass Muzzle Velocity: 1290 ft/s Muzzle Energy: 536 ft-lbs Application: Personal Defense Package Type: Box Included Accessories: Standard Primer Style: Centerfire Lead Free: No Gun Type: Handgun Features of Winchester SUPER-X HANDGUN .357 Magnum 145 grain Silvertip Jacketed Hollow Point Centerfire Pistol Ammunition: Hollow PointProvides maximum stopping power for personal defense scenarios Engineered Jacket ProfileEnsures reliable functioning precise accuracy and consistent expansion Package Contents: Winchester SUPER-X HANDGUN .357 Magnum 145 grain Silvertip Jacketed Hollow Point Centerfire Pistol Ammunition Winchester W357ST: Super-X Handgun Ammo .357 Magnum Silvertip Hollow Point 145 grain 20 Rounds