 The secondary armament consisted of twelve 57 @-@ caliber B @-@ 38 152 mm guns mounted in six dual MK @-@ 4 turrets . Their elevation limits were − 5 ° to + 45 ° with a fixed loading angle of 8 ° . Their rate of fire also varied with the elevation from 7 @.@ 5 to 4 @.@ 8 rounds per minute . They were provided with 170 rounds per gun . The turrets could elevate at a rate of 13 degrees per second and traverse at 6 degrees per second . They had a maximum range of about 30 @,@ 000 meters ( 98 @,@ 425 ft ) with a 55 @-@ kilogram ( 121 lb ) shell at a muzzle velocity of 950 m / s ( 3 @,@ 100 ft / s ) . 
