Yes...i done that, normally i dont fire a torp against to alone ships, or those wich run un groips of 2 or 3 ships, i use my deck gun until run out of ammo prior to use a torp.
Now i am finishing a Gun FX mod where you have new textures for gun muzzle, flashes and explosions, well visible tracer deck gun shells, and i add more powerful AAA and deck gun ammo.
Now i am able to destroy a C2 with 25 AP plus 10 HE shells, about 35 hits total.