Well, but if you're in '44 and you shoot G7aFAT or LUT from far out with hydrophones only - hunting a convoy - you will prefer to use impact pistols only. A volley of four - at 4 meters depth runs under the escorts but will hit any freighter in its way. No keel shots for unnown targets possible - and no duds due to earths magnetic anomalies.
I do it in '41 with G7a too - to have good practise in case of surviving until '44...
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