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Russian 305mm/52
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This gun is the main armament of the Petropavlovsk Class, the  Imperatritsia Maria Class, and the Imperator Nikolai I Class Battleships.

          Russian 305mm/52


     Caliber = 30.5 cm (12.0 inch)
     Shell weight = 471 kg (1038 lbs)
     Muzzle velocity = 820 m/s (2691 fps)

     Relative ballistic performance: 0.85

     Muzzle energy = 158.5 megajoules = 58407.2 foot-tons

     Relative muzzle energy: 1.05

     Barrel length: 52 calibers


     Elevation          Range         Time      Velocity   Fall Angle

       2.5 deg        5300 meters     7.1 sec    678 m/s     2.9 deg
       5.0 deg        9400 meters    13.7 sec    587 m/s     6.2 deg
       7.5 deg       12800 meters    20.0 sec    525 m/s    10.1 deg
      10.0 deg       15700 meters    26.0 sec    482 m/s    14.2 deg
      12.5 deg       18300 meters    31.7 sec    452 m/s    18.4 deg
      15.0 deg       20500 meters    37.2 sec    432 m/s    22.6 deg
      20.0 deg       24300 meters    47.7 sec    411 m/s    30.8 deg
      25.0 deg       27400 meters    57.6 sec    406 m/s    38.0 deg
      30.0 deg       29900 meters    67.1 sec    411 m/s    44.3 deg
      35.0 deg       31800 meters    76.1 sec    421 m/s    49.5 deg
      40.0 deg       33100 meters    84.6 sec    434 m/s    54.1 deg
      45.0 deg       33700 meters    92.7 sec    448 m/s    58.1 deg
      50.0 deg       33500 meters   100.3 sec    462 m/s    61.7 deg


          Armor Penetration - Vertical Belt Armor

               (Relative armor quality, 0.90)

               Maximum penetration: 74.10 cm


     Elevation          Range            Belt       Deck

       1.2 deg        2700 meters        65 cm
       2.0 deg        4300 meters        60 cm
       3.0 deg        6200 meters        55 cm
       3.0 deg        6200 meters         ...        2 cm
       4.2 deg        8100 meters        50 cm
       5.6 deg       10300 meters        45 cm       4 cm
       7.5 deg       12800 meters        40 cm
       8.6 deg       14100 meters         ...        6 cm
      10.0 deg       15700 meters        35 cm
      12.2 deg       18000 meters         ...        8 cm
      13.5 deg       19200 meters        30 cm
      16.9 deg       22000 meters         ...       10 cm
      18.8 deg       23400 meters        25 cm
      20.0 deg       24300 meters         ...       12 cm
      23.1 deg       26300 meters         ...       14 cm
      26.3 deg       28100 meters         ...       16 cm
      27.4 deg       28700 meters        20 cm
      29.7 deg       29700 meters         ...       18 cm
      33.1 deg       31100 meters         ...       20 cm
      36.6 deg       32300 meters         ...       22 cm
      40.2 deg       33100 meters         ...       24 cm
      42.1 deg       33500 meters        15 cm
      43.9 deg       33700 meters         ...       26 cm
      47.8 deg       33700 meters         ...       28 cm


     Maximum range = 33800 meters at 46.4 deg elevation


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