 The main armament consisted of three electrically powered MK @-@ 1 triple turrets , each with three 50 @-@ caliber 406 mm B @-@ 37 guns . The guns could be depressed to − 2 ° and elevated to 45 ° . They had a fixed loading angle of 6 ° and their rate of fire varied with the time required to re @-@ aim the guns . It ranged from 2 @.@ 0 to 2 @.@ 6 rounds per minute depending on the elevation . The turrets could elevate at a rate of 6 @.@ 2 degrees per second and traverse at 4 @.@ 55 degrees per second . 100 rounds per gun were carried . The guns fired 1 @,@ 108 @-@ kilogram ( 2 @,@ 443 lb ) projectiles at a muzzle velocity of 830 m / s ( 2 @,@ 700 ft / s ) ; this provided a maximum range of 45 @,@ 600 meters ( 49 @,@ 900 yd ) . 
