This is my Fer de Lance
A ship builder, outfitting and comparison tool for Elite Dangerous
coriolis.io
Two medium efficient thermal vent beams
Two medium overcharged autoloader multicannons
One huge overcharged corrosive multicannon
The huge multicannon is a cool weapon as shadowhand alluded to. The fact it has no spin-up time makes it unique. It's not a rotating gatling-gun sort of arrangement. One of Elite's most glaring limitations in my view is the fact we can only have two firegroups. The huge MC with no spin up makes me feel almost like I have three firegroups. By putting it on the same firegroup as the medium MCs, I can use the huge MC selectively with quick trigger pulls. Each pull spits out a single corrosive shell. If I want to add the outboard autoloaders I just hold the trigger down a little longer so they complete their spin-up.
This in effect creates a dual-stage trigger, allowing me to apply corrosive as needed, while being selective with autoloader ammunition expenditure. So for example you're giving the good news to a ship that's down to it's last few points of hull and you're holding the beams on him to save MC ammo. A quick pull of the trigger spits out that corrosive shell to boost the beam damage.
Two medium beams isn't quite enough shield-stripping power for me, but it does the trick. I could have gone for four medium beams, but I love multicannons and especially autoloaders, which I think are very underrated.