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Russian 254mm/50
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This gun was the main armament of the armored cruiser Riurik.  Since the Riurik was scrapped to conform to the provisions of the Treaty of Cleito, this caliber is presently found on the Danube class monitor and in the Coast Artillery.

Russian 254mm/50 Model 1908
 
     Caliber = 25.4 cm (10.0 inch)
     Shell weight = 225 kg (496 lbs)
     Muzzle velocity = 879 m/s (2882 fps)
     Relative ballistic performance: 0.75
     Muzzle energy = 86.881 megajoules = 32015.6 foot-tons
     Relative muzzle energy: 1.00
     Barrel length: 50 calibers

     Elevation          Range         Time      Velocity   Fall Angle
       2.5 deg        5500 meters     7.4 sec    635 m/s     3.1 deg
       5.0 deg        9200 meters    14.0 sec    513 m/s     7.1 deg
       7.5 deg       12100 meters    20.1 sec    441 m/s    11.8 deg
      10.0 deg       14400 meters    25.8 sec    396 m/s    16.8 deg
      12.5 deg       16300 meters    31.2 sec    368 m/s    21.9 deg
      15.0 deg       17900 meters    36.3 sec    350 m/s    26.8 deg
      20.0 deg       20700 meters    45.9 sec    334 m/s    35.9 deg
      25.0 deg       22900 meters    55.0 sec    333 m/s    43.7 deg
      30.0 deg       24700 meters    63.6 sec    340 m/s    50.1 deg
      35.0 deg       26000 meters    71.8 sec    350 m/s    55.3 deg
      40.0 deg       26800 meters    79.7 sec    362 m/s    59.7 deg
      45.0 deg       27200 meters    87.1 sec    375 m/s    63.3 deg
      50.0 deg       27000 meters    94.1 sec    387 m/s    66.5 deg

          Armor Penetration - Vertical Belt Armor
               (Relative armor quality, 1.00)
               Maximum penetration: 51.79 cm

     Elevation          Range            Belt       Deck
       1.3 deg        3200 meters        40 cm
       2.2 deg        4900 meters        35 cm
       3.3 deg        6800 meters        30 cm
       4.5 deg        8600 meters         ...        2 cm
       5.0 deg        9200 meters        25 cm
       7.5 deg       12100 meters        20 cm
      10.1 deg       14400 meters         ...        4 cm
      12.1 deg       16000 meters        15 cm
      17.1 deg       19200 meters         ...        6 cm
      22.2 deg       21700 meters        10 cm
      23.0 deg       22100 meters         ...        8 cm
      29.3 deg       24400 meters         ...       10 cm
      36.1 deg       26200 meters         ...       12 cm
      43.8 deg       27200 meters         ...       14 cm

     Maximum range = 27200 meters at 45.6 deg elevation
 
 


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