I tried using missiles as a way to quickly end a fight after the shields were down, but mostly I ended up having to continue the battle with 1 or 2 less guns. Missiles are not a good choice against another fighter. However, I have a bomber loaded out with 2 Novas and 4 Cannonballs. You may laugh, but this is done with a single purpose in mind - to take out cap ships. This has been a successful configuration against large ships. Against another fighter class....well, I have to run away:P