Sturmtiger The main armament was the 380 mm Raketen-Werfer 61 L/5.4, a breech-loading rocket launcher, which fired short-range, rocket-propelled projectiles roughly 1.5 m long. There were a variety of rounds with a weight of up to 376 kg, and a maximum range of up to 6,000 m, which either contained a high explosive charge of 125 kg or a shaped charge for use against fortifications, which could penetrate up to 2.5 m of reinforced concrete.