 The main battery of the Fusō class underwent multiple modernizations throughout the ships ' careers . During the first reconstruction of both vessels , the elevation of the main guns was increased to − 5 / + 43 degrees , giving a maximum firing range of 35 @,@ 450 yards ( 32 @,@ 420 m ) . The recoil mechanism of the guns was also changed from a hydraulic to pneumatic system , which allowed for a faster firing cycle of the main guns . 
