7.5×55mm Swiss
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The 7.5×55mm Swiss or 7,5mm GP 11 is a cartridge developed for the Swiss Army. It originated from the Gewehrpatrone 1890 developed in 1898 by mechanical engineer Lt. Col. Eduard Rubin for rifles based on Rudolf Schmidt's action design. Wikipedia
Base diameter: 12.60 mm (0.496 in)
Case capacity: 4.22 cm3 (65.1 gr H2O)
Designed: 1911
In service: 1911–present
Maximum pressure: 380 MPa (55,000 psi)
Rifling twist: 270 mm (1 in 10.63 in)
Used by: Switzerland, Israel