
The 7.5×55mm Swiss cartridge, also known as 7.5×55mm GP11, is a rifle cartridge developed in Switzerland and introduced in 1911. It was commonly used in the Swiss Schmidt–Rubin series of rifles, particularly the K31 bolt-action rifle. The cartridge is noted for its accuracy and relatively flat trajectory, which made it a preferred choice for marksmanship and target shooting.
The cartridge typically fires a 174-grain (11.3 grams) full metal jacket bullet at a velocity of about 2,560 feet per second (780 meters per second), though loadings can vary. The 7.5×55mm Swiss is similar in ballistics to the .308 Winchester/7.62x51mm NATO, offering good performance at medium to long ranges.
Its modern applications include sport shooting, particularly in competitive events due to the high precision of rifles chambered for this cartridge. It is also popular among collectors and historical reenactors.
Factory ammunition for the 7.5×55mm Swiss is available, though not as common as more widespread calibers, and handloading components are also accessible for enthusiasts.