There are a lot of variables that go into making long shots. If the convoy or ships are not in a zig zag pattern, then shooting past 2000m is not unheard of and getting a hit or hits.
If there are a lot of ships in a line I will launch a whole bow load at the front ship and sometimes another of my torps will hit another ship behind it.. I usually only shoot past 2000m if the ships are slow.
If you are up against a fighting ship, I won't even think about shooting untill within 900m or less. I have launched torps and then see the ship zig or zag and miss completely. I will also switch the fish to fast, depending on if I have one capable in the tube, to help ensure a hit.
It is all a judgement call. What the situation is around you deepends on how you make an attack. Each person is different and does things different ways. Just seeing what works for you and adjusting to the tactics of the enemy will get you far.
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