James Purdey & Sons Royal double rifle in .600 Nitro Express with 26-inch barrels. The most powerful sporting double rifle in regular production, generating over 10,000 ft-lbf of combined energy from two barrels. Type: Rifle Action: Double Rifle Caliber: .600 Nitro Express Capacity: 2 Year introduced: 1903, UK Weight: 16 oz Overall length: 44" Status: Active Intended use: Dangerous Game, Safari