Underwood Ammo 10mm Auto 135 Grain Jacketed Hollow Point Nickel Plated Brass Cased Pistol Ammo 20 Rounds. Specifications for Underwood Ammo 10mm Auto 135 Grain Jacketed Hollow Point Nickel Plated Brass Cased Pistol Ammunition: Manufacturer: Underwood Ammo Caliber: 10mm Auto Number of Rounds: 20 Bullet Type: Jacketed Hollow Point (JHP) Bullet Weight: 135 grain Cartridge Case Material: Nickel Plated Brass Muzzle Velocity: 1600 ft/s Muzzle Energy: 768 ft-lbs Application: Hunting Package Type: Box Primer Style: Centerfire Lead Free: No Dimensions: 1.45 X 2.70 X 3.20 in Package Contents: Underwood Ammo 10mm Auto 135 Grain Jacketed Hollow Point Nickel Plated Brass Cased Pistol Ammo Underwood Ammo 231: 10mm Auto 135 Grain Jacketed Hollow Point Nickel Plated Brass Cased Pistol Ammo 20 Rounds