A Bofors built-up design using an ogival screw breech used only on the seaplane carrier Gotland. The twin turrets on Gotland were electrically powered with hydraulic drive gears and the guns were individually sleeved.

For financial reasons, two of these guns were mounted in casemates.

Gun Characteristics

Designation 15.2 cm/55 (6") Model 1930
Ship Class Used On Gotland
Date Of Design 1930
Date In Service 1934
Gun Weight N/A
Gun Length about 331 in (8.400 m)
Bore Length about 300 in (7.620 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire about 5 rounds per minute


Type Bag
Projectile Types and Weights AP: 101 lbs. (46 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge 36.4 lbs. (16.5 kg)
Muzzle Velocity AP: 2,953 fps (900 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A


Range with 101 lbs. (46 kg) AP
Elevation Distance
45 degrees (Turrets) 26,700 yards (24,400 m)
30 degrees (Casemates) about 18,000 yards (16,460 m)

Mount/Turret Data

Designation Gotland: Twin Turrets (2) and Single Casemates (2)
Weight Twin Turrets: 70.9 tons (72 mt)
Casemates: N/A
Elevation Turrets: -5 / +60 degrees
Casemates: -5 / +30 degrees
Elevation Rate N/A
Train Turrets: about +120 / -120 degrees
Casemates: about +5 to +150 degrees 1 2
Train Rate N/A
Gun recoil N/A
Loading Angle -10 to +20 degrees
  • ^In examining photographs, it does not appear that the casemate guns could fire directly forward.
  • ^Casemate guns were removed during the 1950s when Gotland was converted to a fighter direction ship.

Additional Pictures


"Naval Weapons of World War Two" by John Campbell
"Cruisers of World War Two" by M.J. Whitley
Bofors Catalog 1936
Special help from Tony Williams

Page History

10 August 2003 - Benchmark
09 March 2019 - Converted to HTML 5 format, added photographs from Bofors Catalog 1936