Talk:Type 91 Armor Piercing Shell/@comment-117.5.164.198-20151121090420/@comment-26486243-20151218163918

Type 91 shells add post-cap damage against installations (+~8% in DA/APCI build). Type 3 shells add pre-cap damage against installations (+150%).

Where battleships at firepower cap are concerned, AP shells are superior if they fight only in the day (combined fleet main fleet), while Type 3 shells are superior if the battle is expected to enter night phase (as the firepower cap of night battle is 300 rather than 150).

AP shells have zero effect in night battle apart from their base stat bonuses.