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French 12"
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Treaty tables

The 12"/45 is the main armament of the Courbet Class Battleships.

          305mm/45

     Caliber = 30.5 cm (12.0 inch)
     Shell weight = 432 kg (952 lbs)
     Muzzle velocity = 778 m/s (2552 fps)
     Relative ballistic performance: 1.00
     Muzzle energy = 130.7 megajoules = 48168.8 foot-tons
     Relative muzzle energy: 0.87
     Barrel length: 45 calibers

     Elevation          Range         Time      Velocity   Fall Angle
       2.5 deg        4800 meters     6.8 sec    661 m/s     2.8 deg
       5.0 deg        8800 meters    13.2 sec    582 m/s     6.1 deg
       7.5 deg       12100 meters    19.2 sec    527 m/s     9.7 deg
      10.0 deg       14900 meters    25.0 sec    487 m/s    13.6 deg
      12.5 deg       17400 meters    30.6 sec    458 m/s    17.6 deg
      15.0 deg       19600 meters    36.0 sec    438 m/s    21.7 deg
      20.0 deg       23400 meters    46.3 sec    417 m/s    29.6 deg
      25.0 deg       26400 meters    56.0 sec    411 m/s    36.7 deg
      30.0 deg       28900 meters    65.3 sec    414 m/s    42.9 deg
      35.0 deg       30700 meters    74.1 sec    423 m/s    48.3 deg
      40.0 deg       32000 meters    82.5 sec    435 m/s    53.0 deg
      45.0 deg       32500 meters    90.3 sec    448 m/s    57.1 deg
      50.0 deg       32300 meters    97.7 sec    461 m/s    60.9 deg

          Armor Penetration - Vertical Belt Armor
               (Relative armor quality, 1.00)
               Maximum penetration: 56.63 cm

     Elevation          Range            Belt       Deck
       1.4 deg        2700 meters        50 cm
       2.7 deg        5100 meters        45 cm
       3.8 deg        6900 meters         ...        2 cm
       4.3 deg        7800 meters        40 cm
       6.5 deg       10800 meters        35 cm
       7.1 deg       11600 meters         ...        4 cm
       9.4 deg       14300 meters        30 cm
      11.2 deg       16100 meters         ...        6 cm
      13.8 deg       18500 meters        25 cm
      17.0 deg       21200 meters         ...        8 cm
      20.8 deg       23900 meters         ...       10 cm
      20.9 deg       23900 meters        20 cm
      24.7 deg       26300 meters         ...       12 cm
      28.7 deg       28300 meters         ...       14 cm
      32.8 deg       30000 meters         ...       16 cm
      33.7 deg       30300 meters        15 cm
      37.1 deg       31300 meters         ...       18 cm
      41.5 deg       32200 meters         ...       20 cm
      46.2 deg       32500 meters         ...       22 cm

     Maximum range = 32500 meters at 46.1 deg elevation
 


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