28 cm MRK L/40

28 cm MRK L/40
The Ottoman battleship Barbaros Hayreddin or Turgut Reis.
Type	Naval gun Railway gun Coastal artillery
Place of origin	German Empire
Service history
Used by	German Empire Ottoman Empire Chile China
Wars	Boxer Rebellion World War I
Production history
Designer	Krupp
Manufacturer	Krupp
Specifications
Mass	44 t (43 long tons; 49 short tons)
Length	11.2 m (36 ft 9 in) L/40
Barrel length	10.4 m (34 ft 1 in)[1]
Shell	Separate-loading, bagged charge and projectile
Shell weight	240 kg (530 lb)
Caliber	283 mm (11.1 in)[1]
Breech	Horizontal sliding-wedge
Elevation	-5° to +25°
Traverse	-150° to +150°[2]
Rate of fire	1 round every two minutes
Muzzle velocity	715 m/s (2,350 ft/s)
Effective firing range	11 km (6.8 mi) at 25°
Maximum firing range	15 km (9.3 mi) at 25°[1]

The 28 cm MRK L/40 was a German naval gun that was used in World War I as the primary armament of the Brandenburg-class pre-dreadnought battleships. Some were also converted to railway guns during World War I.