According the the Uboat Commanders Handbook the uboat would open up with the deckgun and mg's at the same time: at a range of about 600m to 1000m. I don't know if tracers have gotten better, but "tracer burnout" today is about 1000m
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U.Kdt.Hdb B. I. 28) This possibility of using the hydrophone to help in detecting surface ships should, however, be restricted to those cases where the submarine is unavoidably compelled to stay below the surface.
http://www.hackworth.com/
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