Don't assault a convoy with only your deckgun. Unless you are absolutely sure they do not shoot back, or their protecting escorts aren't there to shoot back.
So where are you exactly (grid please!) and what type are you in. Maybe we can find you a pitstop.
I have the same thing. I was supposed to go to a grid location (iirc CG79, only March 1940). I went around the Brits from the north where I ran into a convoy inbound for the north passage to the irish sea. Almost got to the 100K tonnage level (thanks to the HMS Rodney) after using all my torpedos and shells on the remaining convoy members. So I considered going back home. But I noticed the uboat tender in Vigo, Portugal opened up business recently. So I went there and docked. I haven't started my extended patrol yet so I don't know how many torpedos it has for me.
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