"The 505 Gibbs round was invented in Bristol, England in 1911 by George Gibbs. The round was originally known as the .505 magnum, and has a case capacity of 161 grains (10.4 g). Loads can be made up to over 9,000 ft·lbf (12,000 J), 2,600 ft/s (790 m/s) with a 600-grain (39 g) bullet. The cartridge is a non-belted magnum with a 75.16 degree shoulder angle.
Intended for hunting elephant, cape buffalo or stopping lions, the cartridge is renowned for its use by Robert Wilson, the hunter of Ernest Hemingway fame.
The round is second only in factory loads to the .500 Jeffrey round, but with home loading the Gibbs exceeds this too.
Some modern rifles are chambered for the .505 Gibbs. Examples include the CZ 550 magnums, M98 Mauser magnums, and other custom rifles. Many of the custom guns are very expensive, from high-end makers.
Made famous by Ernest Hemingway, he was very fond of this caliber rifle and talked of it in some of his writings and interviews. The round has been around longer than the 50 BMG itself. Modern semi-automatic rifles are available in this caliber from Vigilance Rifles."
505 Gibbs. (2009, March 17). In Wikipedia, The Free Encyclopedia. Retrieved 15:36, March 23, 2009, from http://en.wikipedia.org/w/index.php?title=505_Gibbs&oldid=277851847