Cannone navale da 381/40

Journalists inspecting a 15-inch Cannone navale da 381/40 along the Adriatic coast
Type	naval gun, coast-defense gun, railroad gun
Place of origin	Kingdom of Italy
Service history
In service	1916–1945
Used by	Kingdom of Italy
Production history
Designed	1913–1914
No. built	about 24
Specifications
Mass	63–83.56 long tons (64.0–84.9 t)
Length	15.74 m (51 ft 8 in)
Barrel length	15.2 m (49 ft 10 in)
Shell weight	875 or 884 kg (1,929 or 1,949 lb)
Caliber	381 mm (15 in)
Breech	Interrupted screw
Elevation	+20°, later +30°
Muzzle velocity	700 m/s (2,297 ft/s)
Effective firing range	19,800 m (21,700 yd) at +20° elevation
Filling weight	38.5 or 50 kg (85 or 110 lb)

The Cannone navale da 381/40 was an Italian naval gun intended to equip the dreadnought battleships of the Francesco Caracciolo class. The ships were cancelled in 1916 and their guns were diverted to other uses. Four of the seven turned over to the Esercito Italiano (Italian Army) became railroad guns, six were used as coast-defense guns and the rest were used on monitors to provide naval gunfire support for the Army. Most of the monitors were disarmed after World War I and their guns were transferred to coast-defense batteries which were used throughout World War II.