Possibly manufactured by Krupp and used on a Coastal Defense Ship. Overall length was 42.16 calibers and it appears that the actual bore length was 39.58 calibers.

Gun Characteristics

Designation 28.3 cm/42.5 (11.1")
Ship Class Used On Zeven Provinciën (later renamed Soerabaia)
Date Of Design N/A
Date In Service 1910
Gun Weight 33.5 tons (34 mt)
Gun Length oa 470 in (11.930 m)
Bore Length 441 in (11.201 m)
Rifling Length N/A
Grooves N/A
Lannds N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire about 2 rounds per minute


Type Bag
Projectile Types and Weights AP: 666 lbs. (302 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge N/A
Muzzle Velocity 2,772 fps (845 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A


Range with 666 lbs. (302 kg) AP
Elevation Distance
15 degrees 17,600 yards (16,100 m)

Mount/Turret Data

Designation Single Turrets: Zeven Provinciën (2)
Weight 194.3 tons (197.4 mt)
Elevation -4 / +15 degrees
Elevation Rate N/A
Train about +120 / -120 degrees
Train Rate N/A
Gun recoil N/A
Loading Angle N/A


Data from:

  • "Naval Weapons of World War Two" by John Campbell
  • "Battleships of World War I" by Peter Hore