Short range with autoloader works great with the Vette and, provides a higher sustained DPS than overcharged.
Another option is long range, not so much for the extra range but for the fact that, at grade 5, it doubles the speed of your shells to 3,200m/s from 1,600m/s.
I have put rapid fire autoloader on mine. You have a lot of ammunition for them and you can run a long time before you need to rearm. Autoloader is fast enough that you can basically fire indefinitely. I'm using small gimballed MCs to apply the corrosive effect. Best part of rapid fire though is the PA-PA-PA-PA-PA-PA-PA-PA of the cannons instead of the slow POM-POM-POM-POM. MCs need dakka, rapid fire does dakka.