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GP 11 is regarded as highly accurate and well-manufactured service ammunition. For Swiss military service ammunition the primer-type is Berdan. Berdan-primed ammunition is not easy for reloading previously fired cartridges. In addition to the standard full metal jacket GP 11 rounds, specialty rounds were produced as well for the Swiss military.
Boxer primers are similar to Berdan primers with one major difference, the location of the anvil. In a Boxer primer, the anvil is a separate stirrup piece that sits inverted in the primer cup that provides sufficient resistance to the impact of the firing pin as it indents the cup and crushes the pressure-sensitive ignition compound.
Some ammunition with this headstamp was seized before it could be diverted to South Africa in violation of the arms embargo. Headstamp has the 2-digit year of production in front of it. Gevelot-made ammunition was Berdan-primed and IMI-made ammunition was Boxer-primed.
With the advent of chemical primers, it was not long before several systems were invented with many different ways of combining bullet, powder, and primer into a single package which could be loaded quickly from the breech of the firearm. This greatly streamlined the reloading procedure and paved the way for semi- and fully automatic firearms.
Most surplus ammunition is steel-cased and uses Berdan primers, which effectively hinders its use for handloading. However, with the increased popularity of surplus Eastern-bloc Mosin–Nagant, SVT-40, and PSL rifles in the United States, Boxer-primed ammunition and unfired cases are increasingly available; these cases take large rifle primers.
The primer type is Berdan (military ammo) or Boxer (some commercial ammo) Large rifle. According to the official C.I.P. [ 6 ] (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the 7.5×54mm French can handle up to 380.00 MPa (55,114 psi) P max piezo pressure.
Cutaway diagram of the Berdan-primed cartridge. The 11×59mmR was a rimmed, slightly bottlenecked, centerfire rifle cartridge with an external Berdan primer, developed for use in the single shot, bolt actioned Fusil Gras mle 1874.
Swedish 9mm live ammunition m/39 (left, with black seal) and m/39B (right, with red seal and a slightly more pointed shape) Swedish 9mm live ammunition m/39 and m/39B in their boxes 9mm Parabellum entered Swedish service as m/39 with the import of the Kulsprutepistol m/39 from Austria, with a bullet weight of 7.5 grams (116 gr). [ 31 ]