7.5×55mm Swiss

The 7.5×55mm Swiss or 7,5mm GP 11 (or unofficially 7.5×55mm Schmidt–Rubin) is a cartridge developed for the Swiss Army. It originated from the Gewehrpatrone 1890 (7.5×53.5mm) developed in 1898 by mechanical engineer Lt. Col. Eduard Rubin for rifles based on Rudolf Schmidt's action design. The 7.5×55mm Swiss GP 11 cartridge is similar in appearance to the slightly smaller 7.5×54mm French round though the two are not interchangeable.

This article is about the rifle cartridge. For the pistol cartridge, see 7.5mm 1882 Ordnance.
7.5×55mm GP 11
Two 7×57 cartridges (left) next to a 7.5×55mm / GP 11 (mid), .308 Win (right) and .223 Rem (far right)
TypeRifle
Place of originSwitzerland
Service history
In service1911–present
Used bySwitzerland, Israel
WarsWorld War II (Armed neutrality), 1948 Arab–Israeli War
Production history
Designed1911
Produced1911–present
VariantsGewehrpatrone 1890, Gewehrpatrone 1890/03, GP 90/23, GP 11
Specifications
Case typeRimless, bottleneck
Bullet diameter7.78 mm (0.306 in)
Land diameter7.51 mm (0.296 in)
Neck diameter8.50 mm (0.335 in)
Shoulder diameter11.60 mm (0.457 in)
Base diameter12.60 mm (0.496 in)
Rim diameter12.65 mm (0.498 in)
Rim thickness1.65 mm (0.065 in)
Case length55.60 mm (2.189 in)
Overall length77.70 mm (3.059 in)
Case capacity4.22 cm3 (65.1 gr H2O)
Rifling twist270 mm (1 in 10.63 in)
Primer typeBerdan or boxer large rifle
Maximum pressure380 MPa (55,000 psi)
Ballistic performance
Bullet mass/type Velocity Energy
130 gr (8.4 g) SP 3,000 ft/s (910 m/s) 2,608 ft⋅lbf (3,536 J)
150 gr (9.7 g) SP 2,820 ft/s (860 m/s) 2,658 ft⋅lbf (3,604 J)
174 gr (11.3 g) GP 11 2,560 ft/s (780 m/s) 2,535 ft⋅lbf (3,437 J)
180 gr (11.7 g) SP 2,570 ft/s (780 m/s) 2,642 ft⋅lbf (3,582 J)
200 gr (13.0 g) SP 2,460 ft/s (750 m/s) 2,700 ft⋅lbf (3,700 J)
Source(s): Cartridges of the World
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