L/R: .30-06 Springfield, .375 H&H, .404 Jeffery, .505 Gibbs
|Place of origin||England|
|Case type||Rimless, Bottleneck|
|Bullet diameter||.505 in (Script error mm)|
|Neck diameter||.538 in (Script error mm)|
|Shoulder diameter||.600 in (Script error mm)|
|Base diameter||.640 in (Script error mm)|
|Rim diameter||.640 in (Script error mm)|
|Rim thickness||.065 in (Script error mm)|
|Case length||3.150 in (Script error mm)|
|Overall length||3.850 in (Script error mm)|
|Case capacity||178 gr H2O (11.57 cm³)|
|Rifling twist||1 in 16 (406 mm)|
|Primer type||.254/Kynoch#40/Large Rifle|
|Maximum pressure||39,160 psi (Script error MPa)|
|600 gr (Script error g) Protected Point||2,100 ft/s (Script error m/s)||5,877 ft·lbf (Script error J)|
|600 gr (Script error g) FMJ||2,100 ft/s (Script error m/s)||5,877 ft·lbf (Script error J)|
|525 gr (Script error g) Welded Core SP||2,300 ft/s (Script error m/s)||6,180 ft·lbf (Script error J)|
| Test barrel length: 24"|
Source(s): Norma  & MidwayUSA 
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. CIP 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 magazine rifles.
The .505 Gibbs has a case capacity of 178 grains (Script error g). This cartridge was originally loaded with 90-grain (Script error g) of cordite and 525-grain (Script error g) bullet at 2,300 ft/s (Script error m/s) for 6,166 ft·lbf (Script error J) 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. 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 .505 in (Script error mm) while most other .50 caliber bullets have diameters of .510 in (Script error mm). 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 2,250 ft/s (Script error m/s) for their .505 caliber 525 gr. Weldcore bullets.
Premium dangerous game rifle manufacturers, such as Hartmann & Weiss (Hamburg, Germany) and Westley-Richards (Birmingham, UK) build expensive but thoroughly reliable .505 Gibbs rifles on Mauser 98 actions. Ceska Zbrojovka (CZ) currently manufactures the Safari Classics rifle 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.
Design & SpecificationsEdit
The .505 Gibbs is one of the most voluminous cases designed. The large volume was required as the cartridge was designed to burn cordite as its propellant. CIP has published specifications for the cartridge.
The CIP requires that a barrel have 5 grooves, twist rate of a bore Ø of one revolution in 406 mm (Script error in), a bore Ø of 12.55 mm (Script error in) and a groove Ø of 12.80 mm (Script error in) with each grove measuring 5.33 mm (Script error in) wide. The recommended pressure for the .505 Gibbs is 2,700 bar (Script error psi).
The .505 Gibbs is a niche cartridge, designed for hunting heavy, dangerous game, such as elephant, cape buffalo and grizzly bear.
- Hartmann & Weiss
- .408 Chey Tac
- .338 Xtreme
- .500 Jeffery
- .500 Nitro Express
- .500 No. 2 Express
- .577/.500 Magnum Nitro Express
- .577 Tyrannosaur
- .50 BMG
- List of rifle cartridges
- 12 mm caliber
- Current African Cartridges: The 505 Gibbs
- Barnes, Frank C. (2006) “505 Gibbs” Cartridges of the World 11th Ed.Iola WI. Skinner p. 403