Actually my understanding was that Mark 23 did not enter service until late 43(game allows you to get them too early) after the torpedo bugs were worked out so none went to sea with the magnetic detonator they had the improved firing pin so duds were not a factor.In my mod they do have same chance of running deep throughout the war as do Mark 14's although the constant, major depth problems are solved as they were in real life in late 42.
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