Deck gun ammo mod.

[U777]

I know that the main ammo was HE rounds IIRC, but I know of a mod that makes AP, HE, and SB rounds available and from research some Kaleuns with clout managed to carry whatever rounds they wanted. Since its still early 1940 in my career air power is not really a threat, and merchants are not armed, so I prefer to sink as many as I can with shells (weather permitting) before having to resort to torpedoes and the flares would help at night. What is that mod called?

Three types of ammunition could be fired; armor piercing, high explosive and star burst (flare).

http://www.uboataces.com/tactics-deckgun.shtml