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The .505 Gibbs cartridge was designed by George Gibbs in 1911. The cartridge was originally known as the .505 Rimless Nitro Express or simply as the .505 Rimless. C.I.P. refers to the cartridge as the 505 Mag. Gibbs in their publications. It is a .50 caliber (12.8 mm) rimless bottlenecked cartridge intended for magazin-fed rifles. ==General information== The .505 Gibbs has a case capacity of of water.〔http://www.huntnetwork.net/modules/wfsection/html/505magnum.pdf〕 This cartridge was originally loaded with of cordite and bullet at for of kinetic energy.〔 While the .505 Gibbs has a greater case capacity than most modern cartridges, it is loaded to lower pressures.〔 The C.I.P. recommends a pressure standard of 2,700 bars (39,160 p.s.i.) for the cartridge.〔(CIP )〕 As .505 Gibbs was intended for hunting dangerous game in a tropical environment and due to the temperature sensitivity of cordite the lower pressures provided a greater safety and reliability margin. The .505 Gibbs has a unique bullet diameter of while most other .50 caliber bullets have diameters of . Barnes Bullets and Woodleigh Bullets are a few of the bullet manufacturers who produce component bullets for reloading in this caliber. Woodleigh Bullets does not recommend impact velocities of over for their .505 caliber 525 gr. Weldcore bullets. Premium dangerous game rifle manufacturers, such as Hartmann & Weiss and Westley Richards build expensive but thoroughly reliable .505 Gibbs rifles on Mauser 98 actions. Ceska Zbrojovka (CZ) currently manufactures the Safari Classics rifle〔http://cz-usa.com/products/by-brand/safari-classics/〕 for this cartridge. Doumoulin Herstal SA of Belgium offers the cartridge in their White Hunter model. Modern semi-automatic rifles are also available in this cartridge from Vigilance Rifles.〔(50 BMG SEMI AUTOMATIC RIFLES )〕 As of 2013, Norma, Nosler and Kynoch are offering loaded ammunition in .505 Gibbs. Bullets are available from Barnes, Cutting Edge Bullets, Woodleigh Bullets, and North Fork Bullets. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「.505 Gibbs」の詳細全文を読む スポンサード リンク
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