From what I understand and Im sure someone will probably tell me wrong but the damage model for HE and AP rounds are basically the same.
Also historically speaking subs did not carry AP rounds for the deck gun.
BTW in case you havent noticed there a lot more rounds carried with the GW mod and for good reason. It takes a lot more rounds to sink a ship, and a LOT more time seeing as the reload time is longer as well.
I believe they plan to address this in the next update. Which is looking awsome btw.
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