Mauser firm's 20 mm MG 151/20, which had both a higher rate of fire and muzzlevelocity. One major disadvantage of the MG FF cannon was its extremely low ammunition
Department (1893), but that document (p. 241) has a lower muzzlevelocity: "The muzzlevelocity of this weapon with the Frankford Arsenal cartridge, with
weight: 3.6 kg Muzzlevelocity: 1800 m/s Muzzle energy: 5.8 MJ Penetration: 245 mm at 0° at 2000 m, 140 mm at 60° at 2000 m, (energy at 2000 m is 4.2 MJ) Entered