depends which bissy

the bishmarck 1945 can have the double for more range, the triple for fast reload + dmg. Up to u

The ship is a bb4 (just with BB6 support slots), and the intended guns are the same 16" L twins used by the H39/41. It even has the same gun space as the H39.

Now, that doesn't stop you from using BB3 guns, but that's obviously a step down and not what the ship was designed for.