 As built , the Fusō class was fitted with a secondary armament of sixteen 50 @-@ caliber six @-@ inch guns mounted in single casemates along the sides of the hull at the level of the upper deck . Eight guns were mounted per side , and each had an arc of fire of 130 degrees and a maximum elevation of + 15 degrees . Each gun could fire a 45 @.@ 36 @-@ kilogram ( 100 @.@ 0 lb ) high @-@ explosive projectile a maximum distance of 22 @,@ 970 yards ( 21 @,@ 000 m ) at a rate of between four and six shots per minute . During their reconstruction in the 1930s , the maximum elevation of the guns was increased to + 30 degrees , which increased their maximum range by approximately 900 metres ( 980 yd ) . 
