kneeling position to take up the recoil. The first man who fired it from the prone position had his collar bone broken." Use The .600 Nitro Express, along with the .577 Nitro Express, was a specialist backup weapon for professional elephant hunters. Too heavy to be carried all day and used effectively, it was usually carried by a gun bearer. It was used when in thick cover and when an effective shot at the heart and lungs was not possible. In his African Rifles and Cartridges, John "Pondoro" Taylor says the shock of a head shot from a .600 Nitro Express bullet is enough to knock out an elephant for up to half an hour. Prominent users In the course of his career, Taylor owned and used two .600 Nitro Express double rifles, the first was regulated for loadings, the second was a W.J. Jeffery & Co double rifle that weighed with barrels and was regulated for 100 gr loadings. He states he was very fond of his Jeffery .600 which he used as a second backup rifle to a .400 Jeffery Nitro Express, and with it he killed between 60 and 70 elephants. Bror von Blixen-Finecke, Karl Larsen and Major Percy Powell-Cotton all used W.J. Jeffery & Co .600 Nitro Express rifles extensively. Parent case In 1929 Holland & Holland produced the .600/577 Rewa by necking down the .600 Nitro Express to accept a bullet. The .50 British ammunition used in the Vickers .50 machine gun was initially a necked-down .600 NE. In popular culture In the 1997 film The Lost World: Jurassic Park the character Roland Tembo carries a Searcy Double Barrel Rifle chambered in .600 Nitro Express. Notes See also 13 mm caliber and over List of rifle cartridges Pfeifer Zeliska .600 Nitro Express revolver References External links Ammo-One, ".600 Nitro Express", ammo-one.com , retrieved 14 September 2017. Cartridgecollector, ".600 Nitro Express", cartridgecollector.net, retrieved 14 September 2017. Pistol and rifle cartridges British firearm cartridges Military cartridges W.J. Jeffery & Co cartridges