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Why does the skyfire special rule say models with skyfire use their normal BS against skimmers?
I don't see anywhere that says models without skyfire would be firing at skimmers as snap shot or with any BS penalty?

Because weapons with Skyfire can only Snap Fire against things not on their list. So if the target isn't a Flyer, Flying Monstrous Creature, or Skimmer the Skyfire weapon can only fire snap shots at it.