I have never had to use two torpedoes for a small merchant. They are armed and accurate however. So I suppose it is best to use one torpedo. It seems that the gun is always in the back, so perhaps if you blow the blast tanks heading straight for the bow at 2000m and closing, you can still use the deck gun--when weather permits. This game shows what limited use the deck gun was.
Another disadvantage to the deck gun is that you have to emerge. I am in late 42. Pretty soon, the air cover will be mericless.
EW
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