I just finished a patrol and sank 5 of them (Yes, Medium Old Composite Freighters), 4 of them with one torpedo impact (the other were duds) and one with two explosions. The longest "sinking time" was about 2 1/2 hours and I accelerated it with about 50 deck gun rounds. All that happened on a patrol in the Marshall and Gilbert Islands with RFB / RSRDC. Since I am playing without map updates my targeting is not perfect and the torpedoes almost never hit exactly where I am aiming at but they hit somewhere.
How long are you waiting? What time do you expect for the sinking?
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