.505 Gibbs

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.505 Gibbs
L-R: .30-06 Springfield, .375 H&H, .404 Jeffery, .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
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)
Test barrel length: 24 inches (610 mm) Source(s): Norma[1]

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.