Schwerer Gustav
>
Schwerer Gustav was a German 80-centimetre railway gun. It was developed in the late 1930s by Krupp in Rügenwalde as siege artillery for the explicit purpose of destroying the main forts of the French Maginot Line, the strongest fortifications in... Wikipedia
Barrel length: 32.5 metres (106 ft 8 in) L/40.6
Caliber: 800 millimetres (31 in)
Designed: 1937
Effective firing range: c. 39,000 metres (43,000 yd)
Elevation: Max of 48°
Height: 11.6 metres (38 ft 1 in)
In service: 1941–1945