I fire as many as needed, generally not more than two or three at the outside per ship are needed. Let it be known that I do not let any merchie get past. Ever. If I've got 3 shells left for the DG, I surface and fire at the rudder / screws. Damn those ships and their supplies!
I also don't mind coasting submerged off their beam to make sure they sink. If a little patience and a lot of good preparation can save me a torpedo, so be it. But again, no one gets past safe if I can help it. You never know when a plane will swoop out of nowhere and damage your scopes beyond repair. That means one quick trip back to port, and I'd hate to roll in with fish still in the tubes.
BTW: I'm using RFB, so merchies are alot harder to come by, also, with 100% realism, I have to fire a small spread to account for miniscule targeting and plotting errors. I'm not perfect, but I have a large warhead that says I'm good enough! SINK!
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