Underwood Ammo 10mm Auto 150 Grain Xtreme Hunter Solid Monolithic Nickel Plated Brass Cased Pistol Ammo 20 Rounds. Specifications for Underwood Ammo 10mm Auto 150 Grain Xtreme Hunter Solid Monolithic Nickel Plated Brass Cased Pistol Ammunition: Manufacturer: Underwood Ammo Caliber: 10mm Auto Number of Rounds: 20 Bullet Type: Monolithic Bullet Weight: 150 grain Cartridge Case Material: Nickel Plated Brass Muzzle Velocity: 1425 ft/s Muzzle Energy: 676 ft-lbs Application: Target Deer Self-Defense Package Type: Box Primer Style: Centerfire Lead Free: Yes Width: 3.25 in Package Contents: Underwood Ammo 10mm Auto 150 Grain Xtreme Hunter Solid Monolithic Nickel Plated Brass Cased Pistol Ammo Underwood Ammo 900: 10mm Auto 150 Grain Xtreme Hunter Solid Monolithic Nickel Plated Brass Cased Pistol Ammo 20 Rounds