Following the introduction of the 458 Winchester Magnum in 1956, Holland & Holland chambered a small number of Royal Double Rifles for this American big-bore cartridge. The 458 Win Mag's semi-rimless case presented design challenges for double-rifle ejectors, but H&H's engineering overcame them. These guns were ordered primarily by American clients who wanted H&H quality with readily available ammunition rather than proprietary British cartridges. Type: Rifle Action: Double / SxS Caliber: 458 Winchester Magnum Capacity: 2 Year introduced: 1958, United Kingdom Weight: 188 oz Overall length: 43" Status: Active Intended use: Dangerous Game