 The main armament consisted of four electrically powered turrets , which were never built . The turrets were designed to elevate and traverse at a rate of 3 ° per second . Each would have had three 52 @-@ calibre 356 @-@ millimetre ( 14 in ) Model 1913 guns . The guns could be depressed to − 5 ° and elevated to + 25 ° . They could be loaded at any angle between − 5 ° and + 15 ° ; the expected rate of fire was three rounds per minute . At full load , 80 rounds per gun could be carried . The guns fired 747 @.@ 6 @-@ kilogram ( 1 @,@ 648 lb ) projectiles at a muzzle velocity of 731 @.@ 5 m / s ( 2 @,@ 400 ft / s ) ; this provided a maximum range of 23 @,@ 240 metres ( 25 @,@ 420 yd ) . 
