.505 GIBBS AMMO
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- .505 Gibbs
- Type Rifle
- Place of origin England
- Production history
- Designer George Gibbs
- Designed 1910
- Manufacturer Gibbs
- Produced 1911
- Specifications
- Parent case none
- Case type Rimless, Bottleneck
- Bullet diameter .505 in (12.8 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 .254/Kynoch#40/Large Rifle
- Maximum pressure 39,000 psi (270 MPa)
Ballistic performance
| Bullet mass/type | Velocity | Energy |
|---|---|---|
| 540 gr (35 g) Norma Solid | 2,300 ft/s (700 m/s) | 6,345 ft⋅lbf (8,603 J) |
| 600 gr (39 g) Woodleigh FMJ | 2,100 ft/s (640 m/s) | 5,877 ft⋅lbf (7,968 J) |
| 600 gr (39 g) Woodleigh Soft Point | 2,100 ft/s (640 m/s) | 5,877 ft⋅lbf (7,968 J) |
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George Gibbs designed .505 Gibbs cartridge in 1911. Gibbs in their publications. It is a .50 caliber rimless bottlenecked cartridge intended for magazine-fed rifles.
The .505 Gibbs has a case capacity of 178 grains (11.5 g) of water. This cartridge was originally loaded with 90-grain (5.8 g) of cordite and 525-grain (34.0 g) bullet at 2,300 ft/s (700 m/s) for 6,166 ft⋅lbf (8,360 J) of kinetic energy.[2] While the.505
Gibbs has a greater case capacity than most modern cartridges, it loaded to lower pressures.
