2-3 km is point blank range for those guns. I think after first 2-4 shells when they got their range correct 8-9 shells out of ten would hit. That is - probably first 2-4 shells miss you but almost all the others hit. And it is not a rocket science. Just try to aim and shoot the deckgun yourself - you'll see it is true. So nothing unrealistic there. The only thing is they should spot you first, but after the look-outs see you - no problem for the guns.
I agree that it should be mostly either miss or kill - 10x10 centimetres hole in the pressure hull means you're unable to dive any more, although inability to dive is 90% death for a U-boat in the long perspective - you would not die straight away though: if you are on the surface it requires many more hits to sink you. On the other hand if you stay on the surface under constant pounding - you would have half of your crew dead very very soon. Hence, giving that we cannot simulate inability to dive, it should be either miss or kill with the gun shells.
|