Ske7ch wrote up how-to score in Halo 3, now we've got a brief guide on what Skulls to use during Campaign.
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okay, easy is .5 times score, normal is 1.0, heroic is 2.0, and legendary is 4.0. If you have a 1.5 skull on normal it is a multiplier of 1.0+1.5=2.5 thus if you have a 1.5 skull on normal, it actually doubles and more you score.