 They had a fixed loading angle of +12 degrees, but there is uncertainty on their new maximum elevation, with some sources citing a maximum value of +27 degrees, while others claim one of +30 degrees.The 320-millimeter AP shells weighed and had a maximum range of with a muzzle velocity of .In early 1942 the rearmost 20-millimeter mounts were replaced by twin 37-millimeter gun mounts and the 20-millimeter guns were moved to the roof of Turret 'B', while the RPC motors from the stabilized mounts of the 90 mm guns were removed.