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7.5x55mm Swiss Ammo

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The 7.5×55mm Swiss or GP 11 (or unofficially 7.5×55mm Schmidt-Rubin) is a cartridge developed for the Swiss Army by mechanical engineer Lt. Col. Eduard Rubin for rifles based on Rudolf Schmidt's action design.

The 7.5 mm Swiss cartridge has been in Swiss Army service since 1889 in their Schmidt–Rubin Model 1889 rifles. Initially using PC 88 (powder composition-88) rauchschwacher cut tubular smokeless single-base powder relying on nitrocellulose as its propellant ingredient, it was known as the Gewehrpatrone 1890.

The 7.5 mm Swiss round was updated to the completely non-corrosive Gewehrpatrone 1911. The bolt thrust of the GP 11 round is relatively high compared to many other service rounds used in the early 20th century.

Besides being used in the Model 1911 rifles and Schmidt–Rubin 1896/11 rifles, GP 11 ammunition was also used in the MG 11 machine gun, K11, and K31 carbines as well as in the Stage 57 battle rifle.

The cartridge saw extensive service until the early 1990s with the standard rifles of Swiss service members, and still sees use by Swiss Army reservists and sport shooters, of which there are many.

About: 7.5x55mm Swiss

• Type: Rifle
• Place of origin: Switzerland
• In service: 1889-present
• Used by: Switzerland
• Wars: World War II (Armed neutrality)
• Designer: Eduard Rubin
• Designed: 1889
• Produced: 1889-present
• Variants: GP90, GP90/03, GP90/23, GP 11
• Specifications
• Case type: Rimless, bottleneck
• Neck diameter: 8.50 mm (0.335 in)
• Shoulder diameter: 11.60 mm (0.457 in)
• Base diameter: 12.60 mm (0.496 in)
• Rim diameter: 12.65 mm (0.498 in)
• Rim thickness: 1.65 mm (0.065 in)
• Case length: 55.60 mm (2.189 in)
• Overall length: 77.70 mm (3.059 in)
• Case capacity: 4.22 cm3 (65.1 gr H2O)
• Rifling twist: 270 mm (1 in 10.63 in)
• Primer type: Berdan or boxer large rifle
• Maximum pressure: 380 MPa (55,000 psi)

Ballistic performance