Talk:Harbour Water Demon/@comment-26352329-20150504142330/@comment-36.70.33.128-20150506055805

I am not sure the mechanics for AP shells. For Type 3 shell, it just plain multiply the damage by 2.5.

AP shell does bonus damage to heavily armored targets in another way. What I know is that AP shells increase the critical hit chance on such targets and increases accuracy. Not sure what the damage bonus is, maybe it ignore some armor. Installation type enemies are considered heavily armored enemies so AP shells also give bonus when fighting these, though generally Type 3 shell is better.

I think AP shells only works in day battle, so equip those on the ships on the main fleet. The escort fleet CAs and FBBs should have the priority of getting Type 3 shells because they will be the ones to finish off the boss in night battle. A single night battle DA from an FBB equipped with Type 3 will usually do her in, though CA also works provided you already damaged her in day battle.