The guns fired 800 kg (1,800 lb) projectiles at a muzzle velocity of 820 meters per second (2,690 ft/s).[25] The main battery was supplied with between 940–960 shells total, for approximately 115–120 shells per gun.[19] As with other German large-caliber naval rifles, these guns were designed by Krupp and featured sliding wedge breech blocks, which required brass cartridge cases for the propellant charges.