Swedish
15.2 cm/55 (6") Model 1930
Updated 10 August 2003
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.
WNSweden_6-55_m1930_Gotland_pic.jpg

Seaplane Cruiser Gotland
Note that the 15.2 cm guns were in both turrets and casemates
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Gun Characteristics
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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
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Ammunition
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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
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Range
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Elevation With 101 lbs. (46 kg) AP shell
Range @ 45 degrees (Turrets) 26,700 yards (24,400 m)
Range @ 30 degrees (Casemates) about 18,000 yards (16,460 m)
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Mount / Turret Data
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Designation Gotland:  Twin Turrets (2) and Single Casemates (2)
Weight  Twin Turrets:  70.9 tons (72 mt)
Elevation Turrets:  -5 / +60 degrees
Casemates:  -5 / +30 degrees
Elevation Rate N/A
Train
(see Note)		 Turrets:  about +120 / -120 degrees
Casemates:  about 5 to 150 degrees
Train Rate N/A
Gun recoil N/A
Loading Angle -10 to +20 degrees
Note:  In examining photographs, it does not appear that the casemate guns could fire directly forward.
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Data from
"Naval Weapons of World War Two" by John Campbell
"Cruisers of World War Two" by M.J. Whitley