Underwood Ammo .480 Ruger 300 Grain Solid Monolithic Brass Cased Pistol Ammo 20 Rounds. Specifications for Underwood Ammo .480 Ruger 300 Grain Solid Monolithic Brass Cased Pistol Ammunition: Manufacturer: Underwood Ammo Caliber: .480 Ruger Number of Rounds: 20 Bullet Type: Monolithic Bullet Weight: 300 grain Cartridge Case Material: Brass Muzzle Velocity: 1400 ft/s Muzzle Energy: 1306 ft-lbs Application: Hunting Package Type: Box Primer Style: Centerfire Lead Free: Yes Last Chance: Yes Dimensions: 1.85 X 3.25 X 5.00 in Height: 1.85 in Width: 3.25 in Package Contents: Underwood Ammo .480 Ruger 300 Grain Solid Monolithic Brass Cased Pistol Ammo Underwood Ammo 650: .480 Ruger 300 Grain Solid Monolithic Brass Cased Pistol Ammo 20 Rounds