Winchester USA Ready .40 SW 155 Grain Hex-Vent HP Pistol Ammo 20 Round. USA Ready Defense is a select grade of personal defense ammunition offering the ideal combination of stopping power penetration and reliable expansion. Specifications for Winchester USA Ready .40 SW 170 Grain Hex-Vent HP Pistol Ammunition: Manufacturer: Winchester Caliber: .40 S&W Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 170 grain Cartridge Case Material: Brass Muzzle Velocity: 1170 ft/s Muzzle Energy: 517 ft-lbs Application: Personal Defense Package Type: Box Included Accessories: Standard Primer Style: Centerfire Lead Free: No Gun Type: Handgun Features of Winchester USA Ready .40 SW 170 Grain Hex-Vent HP Pistol Ammunition Hex-Vent Rigid Insert: Shields hollow point from obstruction while channeling material flow for positive bullet expansion Match Grade Primer: Built to exacting specifications for trusted reliability Package Contents: Winchester USA Ready .40 SW 170 Grain Hex-Vent HP Pistol Ammunition Winchester Win Ammo Usa Ready .40sw 170gr. Jhp 20-pack