The French navy used this gun on the last of their pre-dreadnoughts and on the first of their dreadnought battleships. Both models are listed as being used as railway ordnance during World War I.

Construction was a complicated built-up design, similar to other French heavy guns. The two model types were similar, differing in minor constructional details. Actual bore diameter was 30.5 cm (12.008").

Gun Characteristics

Designation 305 mm/45 (12") Model 1906
305 mm/45 (12") Model 1906-1910
Ship Class Used On Model 1906: Danton class
Model 1910: Courbet class
Date Of Design 1906/1910
Date In Service 1911/1915
Gun Weight 120,590 lbs. (54,700 kg)
Gun Length oa N/A
Bore Length 535.0 in (13.588 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist Uniform RH 1 in 44
Chamber Volume N/A
Rate Of Fire about 1.5 - 2 rounds per minute


Type Bag
Projectile Types and Weights APC: 952 lbs. (432 kg)
HE: 679 lbs. (308 kg)
Bursting Charge N/A
Projectile Length N/A 1
Propellant Charge 2 AP: 274 lbs. (124.3 kg) BM17
HE: 258.2 lbs. (117.1 kg) BM15
Muzzle Velocity AP: 2,569 fps (783 mps)
HE: 2,969 fps (905 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A
  1. ^As this gun had a steep twist (1 in 44), the shells for it were relatively short.
  2. ^Propellant charges were in quarters.


Range with 952 lbs. (432 kg) APC
Elevation Range
23 degrees 28,760 yards (26,300 m)

Mount/Turret Data

  • Two-gun Turrets:
    • Danton (2): Model 1906
    • Courbet (6): Model 1906-1910
Weight 1,236,793 lbs. (561,000 kg)
Elevation -5 / +23 degrees
Rate of Elevation N/A
Train about +150 / -150 degrees
Rate of Train N/A
Gun Recoil N/A
Loading Angle N/A

These mountings were all-electric powered with spring run-out.


Data from:

  • "Battleships and Battlecruisers 1905-1970" by Siegfried Breyer
  • "Naval Weapons of World War Two" by John Campbell
  • "The Big Gun: Battleship Main Armament 1860-1945" by Peter Hodges

Page History

23 May 2006
28 March 2012
Updated to latest template