Underwood Ammo .40 S&W 140 Grain Xtreme Penetrator Solid Monolithic Nickel Plated Brass Cased Pistol Ammo 20 Rounds. Specifications for Underwood Ammo .40 S&W 140 Grain Xtreme Penetrator Solid Monolithic Nickel Plated Brass Cased Pistol Ammunition: Manufacturer: Underwood Ammo Caliber: .40 S&W Number of Rounds: 20 Bullet Type: Monolithic Bullet Weight: 140 grain Cartridge Case Material: Nickel Plated Brass Muzzle Velocity: 1200 ft/s Muzzle Energy: 448 ft-lbs Application: Medium Game Large Game Package Type: Box Included Accessories: None Primer Style: Centerfire Sectional Density: 0.13 Lead Free: No Length: 3.1 in Dimensions: 1.40 X 2.60 X 3.10 in Gun Type: Handgun Package Contents: Underwood Ammo .40 S&W 140 Grain Xtreme Penetrator Solid Monolithic Nickel Plated Brass Cased Pistol Ammo Underwood Ammo 829: .40 S&W 140 Grain Xtreme Penetrator Solid Monolithic Nickel Plated Brass Cased Pistol Ammo 20 Rounds