Jeffery & Co. Sources vary about the date of its introduction,[note 1] although it would seem in 1900 the first .600 Nitro Express rifle was produced by W.J.

[7][8][9] Stuart Cloete, sniping officer for the King's Own Yorkshire Light Infantry, stated "We used a heavy sporting rifle - a .600 Express.

[6] 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.

[5] In the course of his career, Taylor owned and used two .600 Nitro Express double rifles, the first was regulated for 110 gr (7.1 g) loadings, the second was a W.J.

Jeffery & Co double rifle that weighed 16 lb (7.3 kg) with 24 in (610 mm) barrels and was regulated for 100 gr loadings.

[14] In the 1997 film The Lost World: Jurassic Park the character Roland Tembo carries a Searcy Double Barrel Rifle chambered in .600 Nitro Express.