Underwood Ammo 10mm Auto 115 Grain Xtreme Defender Solid Monolithic Nickel Plated Brass Cased Pistol Ammo 20 Rounds. Specifications for Underwood Ammo 10mm Auto 115 Grain Xtreme Defender Solid Monolithic Nickel Plated Brass Cased Pistol Ammunition: Manufacturer: Underwood Ammo Caliber: 10mm Auto Number of Rounds: 20 Bullet Type: Monolithic Bullet Weight: 115 grain Cartridge Case Material: Nickel Plated Brass Muzzle Velocity: 1700 ft/s Muzzle Energy: 738 ft-lbs Application: Hunting Package Type: Box Primer Style: Centerfire Lead Free: Yes Package Contents: Underwood Ammo 10mm Auto 115 Grain Xtreme Defender Solid Monolithic Nickel Plated Brass Cased Pistol Ammo Underwood Ammo 810: 10mm Auto 115 Grain Xtreme Defender Solid Monolithic Nickel Plated Brass Cased Pistol Ammo 20 Rounds