Talk:Type 91 Armor Piercing Shell/@comment-26241434-20150607035122/@comment-26373693-20150609035452

The damage bonus is the same for this item as it is for the 12.7 cm twin cannon. As for the accuracy bonus, in night battles it's the square root of the number of stars the item has, and during the day it's double that. (I can't remember where I got that info from, someone posted test results on Reddit. They looked pretty accurate, though.)