It also depends if the missile/torpedo also has an ATAGS system installed.
ATAGS = Automatic Targeting Acquisition Guidance System.
The old fire and forget it system. The ATAGS system takes over after having the initial target downloaded into it system. This is usually done during the firing process.
Then there is the SAIDS, Self Adjusting Inflight Diagnostic System. This allows a missile/torpedo to acquire a new target if the initial target is either destroyed or disappears (in a Hypershunt, for example).
With ATAGS and SAIDS, you'd have a missile/torpedo that will home in on its target and seek a new one if necessary.
ATAGS and SAIDS can come in a variety of bonuses ranging from +0 to +200 (perhaps higher), depending upon the volume and money willing to spend on each missile/torpedo.
Each +1 of each system adds 0.01 to the missile/torpedo volume and 100 elcreds to each missile/torpedo. Most often, only Imperial forces can afford large bonuses for each missile/torpedo.
rmfr