 Tsesarevich 's main armament consisted of two pairs of 40 @-@ calibre 12 @-@ inch guns mounted in center @-@ pivot , electrically powered , twin @-@ gun turrets fore and aft . The guns and their mountings were Russian @-@ built , but the turrets themselves were made in France . The guns could be loaded at all angles of elevation and the turrets could traverse 270 ° . Trials revealed that the ammunition hoists tended to jam when the ship was rolling ; the shipyard shipped new hoists to Port Arthur because the Russians wanted the ship in the Far East as soon as possible and they were installed in January 1904 . 70 rounds per gun were carried . The guns fired one shell every 90 – 132 seconds . They fired a 731 @.@ 3 @-@ pound ( 331 @.@ 7 kg ) shell at a muzzle velocity of 2 @,@ 598 ft / s ( 792 m / s ) to a range of 16 @,@ 010 yards ( 14 @,@ 640 m ) at an elevation of 15 ° . 
