mk2 


     Caliber = 30.5 cm (12.0 inch) 
     Shell weight = 395 kg (871 lbs) 
     Muzzle velocity = 814 m/s (2668 fps) 

     Relative ballistic performance: 0.85 

     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        5100 meters     7.0 sec    654 m/s     2.9 deg 
       5.0 deg        9000 meters    13.5 sec    556 m/s     6.5 deg 
       7.5 deg       12100 meters    19.6 sec    492 m/s    10.5 deg 
      10.0 deg       14700 meters    25.3 sec    449 m/s    14.7 deg 
      12.5 deg       17000 meters    30.8 sec    420 m/s    19.1 deg 
      15.0 deg       18900 meters    36.1 sec    400 m/s    23.6 deg 
      20.0 deg       22300 meters    46.2 sec    380 m/s    32.1 deg 
      25.0 deg       24900 meters    55.6 sec    376 m/s    39.4 deg 
      30.0 deg       27100 meters    64.6 sec    381 m/s    45.8 deg 
      35.0 deg       28700 meters    73.2 sec    391 m/s    51.2 deg 
      40.0 deg       29800 meters    81.3 sec    403 m/s    55.7 deg 
      45.0 deg       30300 meters    89.0 sec    416 m/s    59.6 deg 
      50.0 deg       30000 meters    96.2 sec    429 m/s    63.2 deg 


          Armor Penetration - Vertical Belt Armor 

               (Relative armor quality, 1.00) 

               Maximum penetration: 56.63 cm 


     Elevation          Range            Belt       Deck 

       1.9 deg        4000 meters        45 cm
       3.0 deg        6000 meters        40 cm
       3.9 deg        7300 meters         ...        2 cm 
       4.6 deg        8400 meters        35 cm
       6.7 deg       11100 meters        30 cm
       7.6 deg       12200 meters         ...        4 cm 
       9.7 deg       14400 meters        25 cm
      12.8 deg       17200 meters         ...        6 cm 
      14.5 deg       18500 meters        20 cm
      18.3 deg       21200 meters         ...        8 cm 
      22.6 deg       23700 meters         ...       10 cm 
      23.2 deg       24100 meters        15 cm
      27.2 deg       26000 meters         ...       12 cm 
      31.9 deg       27800 meters         ...       14 cm 
      36.9 deg       29200 meters         ...       16 cm 
      41.7 deg       30000 meters        10 cm
      42.1 deg       30100 meters         ...       18 cm 
      47.8 deg       30200 meters         ...       20 cm 


     Maximum range = 30300 meters at 46.0 deg elevation