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After the tests of German-made Hagler bullets proved the possibilities of that type ammunition in perforating steel plate, the National Ammunition Factory in Skarżysko-Kamienna was ordered to develop its own 7.92 mm cartridge with a muzzle velocity of over 1,000 meters per second.
Maximum muzzle velocity comparison in % of the probably most proliferated European and American 8 mm rifle cartridges out of 650 mm (25.59 in) long barrels loaded with relatively light to heavy 8 mm bullets to their CIP or SAAMI (Sporting Arms and Ammunition Manufacturers’ Institute) sanctioned maximum pressures.
At 780 m/s (2560 ft/s) muzzle velocity the standard GP 11 ball bullet retained supersonic velocity up to 800 m (875 yards) (V800 ≈ Mach 1.1) under ICAO Standard Atmosphere conditions at sea level (air density ρ = 1.225 kg/m3).
James Richard Haskell was an American inventor chiefly remembered for his invention (with Azel S. Lyman) of a multi-charge gun which was intended to increase muzzle velocity by detonating additional propellant charges behind the projectile or shell as it moved up the gun's barrel and was a distant ancestor of the World War II German V-3 "supergun".
He lost his hearing in the 1950s when testing a high Muzzle velocity Rifle for the British Army, until recently, when surgery to fit a cochlear implant allowed him to recover some of his hearing.