.505 Gibbs
The .505 Gibbs cartridge was designed by George Gibbs in 1911. The cartridge was originally known as the .505 Rimless Nitro Express. The 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 magazine-fed rifles.
| .505 Gibbs | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Type | Rifle | |||||||||||||||
| Place of origin | England | |||||||||||||||
| Production history | ||||||||||||||||
| Designer | George Gibbs | |||||||||||||||
| Designed | 1910 | |||||||||||||||
| Manufacturer | Gibbs | |||||||||||||||
| Produced | 1911–present | |||||||||||||||
| Specifications | ||||||||||||||||
| Case type | Rimless, bottleneck | |||||||||||||||
| Bullet diameter | .505 in (12.8 mm) | |||||||||||||||
| Land diameter | .494 in (12.5 mm) | |||||||||||||||
| Neck diameter | .535 in (13.6 mm) | |||||||||||||||
| Shoulder diameter | .600 in (15.2 mm) | |||||||||||||||
| Base diameter | .640 in (16.3 mm) | |||||||||||||||
| Rim diameter | .640 in (16.3 mm) | |||||||||||||||
| Rim thickness | .065 in (1.7 mm) | |||||||||||||||
| Case length | 3.150 in (80.0 mm) | |||||||||||||||
| Overall length | 3.850 in (97.8 mm) | |||||||||||||||
| Case capacity | 178 gr H2O (11.5 cm3) | |||||||||||||||
| Rifling twist | 1 in 16 (406 mm) | |||||||||||||||
| Primer type | magnum large rifle | |||||||||||||||
| Maximum pressure | 39,000 psi (270 MPa) | |||||||||||||||
| Ballistic performance | ||||||||||||||||
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| Test barrel length: 24 inches (610 mm) Source(s): Norma | ||||||||||||||||
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