Kind of curious why you're getting that close in the first place. My experience has been that that the sweet spot is a range to target of roughly 700-1000m for the deck gun. Farther away and it gets increasingly difficult to reliably pump shells into the vitals...any closer and it becomes difficult to get enough shell drop to hit the target BELOW the waterline. At 500m you're essentially firing the shells flat.
A target at 400 m or less is only going to take a waterline hit if you use the downward roll. Doing that though tends to result in the occasional shell getting planted smack into the face of a wave halfway to the target.
Now for the flak gun 300-400 m makes sense. Though the kinds of targets that you'd use the flak gun on its usually less a case of doing waterline damage than it is simply pouring a few clips straight into an engine or fuel tank.
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