Halo reach: which campaign mission gives you the highest meta score?

I am thinking of going for the weekly challenge, getting 80,000 score on a campaign mission on reach but im not sure which mission will give you the highest base score and then i will be using alot of skulls on top of that and either on heroic or legendary, solo or maybe 2 people. Normally i think you can tell the score by what the target score is, but i will leave that to you guys ;).