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Russian 305mm/40
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This gun is the main armament of Russian Predreadnought Battleships.

         305mm/40

     Caliber = 30.5 cm (12.0 inch)
     Shell weight = 471 kg (1038 lbs)
     Muzzle velocity = 689 m/s (2259 fps)
     Relative ballistic performance: 0.80
     Muzzle energy = 111.7 megajoules = 41169.9 foot-tons
     Relative muzzle energy: 0.74
     Barrel length: 40 calibers

     Elevation          Range         Time      Velocity   Fall Angle
       2.5 deg        3800 meters     6.0 sec    595 m/s     2.8 deg
       5.0 deg        7000 meters    11.7 sec    528 m/s     6.0 deg
       7.5 deg        9700 meters    17.2 sec    480 m/s     9.6 deg
      10.0 deg       12000 meters    22.4 sec    445 m/s    13.4 deg
      12.5 deg       14000 meters    27.4 sec    419 m/s    17.4 deg
      15.0 deg       15800 meters    32.2 sec    401 m/s    21.3 deg
      20.0 deg       18900 meters    41.4 sec    380 m/s    29.1 deg
      25.0 deg       21300 meters    50.2 sec    373 m/s    36.4 deg
      30.0 deg       23200 meters    58.4 sec    375 m/s    42.7 deg
      35.0 deg       24600 meters    66.2 sec    381 m/s    48.3 deg
      40.0 deg       25400 meters    73.6 sec    391 m/s    53.1 deg
      45.0 deg       25700 meters    80.6 sec    401 m/s    57.5 deg
      50.0 deg       25400 meters    87.0 sec    412 m/s    61.3 deg

          Armor Penetration - Vertical Belt Armor
               (Relative armor quality, 1.00)
               Maximum penetration: 51.00 cm

     Elevation          Range            Belt       Deck
       1.5 deg        2400 meters        45 cm
       3.2 deg        4700 meters        40 cm
       4.1 deg        5900 meters         ...        2 cm
       5.2 deg        7300 meters        35 cm
       7.8 deg       10000 meters         ...        4 cm
       8.1 deg       10300 meters        30 cm
      12.2 deg       13800 meters        25 cm
      12.4 deg       13900 meters         ...        6 cm
      18.2 deg       17900 meters         ...        8 cm
      18.8 deg       18200 meters        20 cm
      22.4 deg       20100 meters         ...       10 cm
      26.7 deg       22000 meters         ...       12 cm
      30.1 deg       23200 meters        15 cm
      31.2 deg       23600 meters         ...       14 cm
      35.8 deg       24700 meters         ...       16 cm
      40.7 deg       25500 meters         ...       18 cm
      45.7 deg       25700 meters         ...       20 cm
      48.6 deg       25600 meters        10 cm

     Maximum range = 25700 meters at 45.0 deg elevation


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