page_title: 7.5×55mm Swiss
section_title: GP90/23 cartridge variant for the Model 1889 rifle
hierarchical_section_title: 7.5×55mm Swiss / History of the cartridge variants / GP90/23 cartridge variant for the Model 1889 rifle
caption_attribution_description: Français&#160;: Poudre propulsive PC 88 de la cartouche GP 1890/23 English: PC 88 square flake shaped rauchschwacher (literally "low smoke") propellant used in the GP90/23 cartridge. As a single-base powder PC 88 relies on nitrocellulose as its propellant ingredient.
context_page_description: The 7.5×55mm Swiss or GP 11 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 ammunition used by the Schmidt–Rubin Model 1889 rifle was one of the first to use 7.5 mm copper-jacketed rounds similar to those used today. The GP90 7.5×53.5mm round designed by Rubin was revolutionary in that the most popular military calibres used in Europe at the time were around 10 to 14 mm as opposed to 7.5 mm of the Schmidt–Rubin ammunition. The 7.5x55mm Swiss cartridge is similar in appearance to the slightly smaller 7.5x54mm French round though the two are not interchangeable.
context_section_description: Long after the discontinuation of the Schmidt–Rubin Model 1889 rifle in the Swiss Armed Forces, the GP90/03 round was updated in 1923 and called the GP90/23, for use in shooting competitions. The GP90/23 dispensed with the paper patching around the bullet and was loaded with a full metal jacket (FMJ) non-heeled round-nose bullet. The PC 88 propellant shape was changed to square flakes.
  GP90, GP90/03 and  GP90/23 ammunition was available in nine different variants.
caption: PC 88 square flake shaped propellant used in the GP 90/23 cartridge variant
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