Brief Description:  The Pumhart von Steyr is an early 15th-century Austrian supergun and the largest known wrought-iron bombard by caliber in medieval history. Designed for siege warfare, the 8-ton cannon hurled a 690 kg (1520 lb) stone projectile up to 600 meters. It is currently on display at the Museum of Military History (Heeresgeschichtliches Museum) in Vienna.

Design and Construction:

Type: Wrought-iron bombard (built similarly to a wooden barrel with staves and rings).

Weight: Approximately 8 t (7.9 long tons).

Length: 2.59 m (8 ft 6 in), with a barrel length of 1.44 m (57 in).

Caliber: Conical muzzle with a massive diameter of 800 mm (31 in).

Ballistics and Performance:

Ammunition: Fired spherical stone balls weighing around 690 kg.

Propellant: Required a gunpowder charge of roughly 15 kg (33 lb).

Range: Calculated modern trajectory could send the stone ball roughly 600 m (2000 ft) at an elevation of 10°.

Rate of Fire: Due to its immense size and weight, the weapon took a crew of 4-6 men about 2 to 3 minutes to reload a single shot.