These were Elswick Pattern "W" and were used on armored cruisers.

These guns were wire-wound for 75% of their length.

Gun Characteristics

Designation 10"/45 (25.4 cm) Model 1908
Ship Class Used On San Marco Class
Manufacturer Elswick Pattern "W"
Date Of Design 1908
Date In Service 1910
Gun Weight 34.5 tons (35.0 mt)
Gun Length oa 468.8 in (11.909 m)
Bore Length 450.0 in (11.430 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume 11,000 in3 (180.26 dm3)
Rate Of Fire 2.6 rounds per minute


Type Bag
Projectile Types and Weights AP: 500 lbs. (227 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge 186 lbs. (84.2 kg) C
Muzzle Velocity 2,854 fps (870 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A


Range with 500 lbs. (227 kg) AP
Elevation Distance
25 degrees about 27,300 yards (25,000 m)

Mount/Turret Data

Designation Twin Turrets: San Marco (2)
Weight N/A
Elevation -5 / +25 degrees
Elevation Rate N/A
Train about +150 / -150 degrees
Train Rate N/A
Gun recoil N/A
Loading Angle N/A

Additional Pictures


Data from:

  • "Naval Weapons of World War Two" by John Campbell
  • "Italian Warships of World War II" by Aldo Fraccaroli

Press releases:


28 December 2008
13 September 2011
Added link to 3"/40 (7.62 cm) gun