.256 Gibbs Magnum

The .256 Gibbs Magnum is an obsolete rimless bottleneck centerfire rifle cartridge developed by George Gibbs of Bristol and introduced in 1913.

.256 Gibbs Magnum
Type	Rifle
Place of origin	England
Production history
Designer	George Gibbs of Bristol
Designed	1913
Produced	1913–present
Specifications
Parent case	6.5×57mm Mauser
Case type	Rimless, bottleneck
Bullet diameter	.264 in (6.7 mm)
Neck diameter	.292 in (7.4 mm)
Shoulder diameter	.430 in (10.9 mm)
Base diameter	.471 in (12.0 mm)
Rim diameter	.474 in (12.0 mm)
Case length	2.17 in (55 mm)
Overall length	3.09 in (78 mm)
Ballistic performance
Bullet mass/type Velocity Energy 145 gr (9 g) SP 2,600 ft/s (790 m/s) 2,178 ft⋅lbf (2,953 J)
Source(s): Cartridges of the world.

Overview

The .256 Gibbs Magnum was designed and introduced by George Gibbs in 1913 for use in their own Mauser style sporting rifles. The cartridge was created by reducing the neck of the 6.5×57mm Mauser by 2 mm.

The .256 Gibbs Magnum is very similar to, but not interchangeable with, the 6.5×55mm Swedish cartridge.

One famous user of the .256 Gibbs Magnum was Denis D. Lyell who used a rifle in this calibre for hunting in Africa.

See also

• List of rifle cartridges

External links

• Ammo-One, ".256 Gibbs Magnum", ammo-one.com, retrieved 4 February 2018.
• Cartridgecollector, ".256 Gibbs", cartridgecollector.net, retrieved 4 February 2018.
• George Gibbs Ltd, "History", gibbsgunmakers.com, retrieved 4 February 2018.
• Imperial War Museums, "6.5 X 55: Kynoch; .256 Gibbs Magnum, Hollow Point", iwm.org.uk, retrieved 4 February 2018.
• The Spanish Association of Cartridge Collectors, ".256 Gibbs Magnum", municion.org Archived 2018-02-04 at the Wayback Machine, retrieved 4 February 2018.