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I'll be starting a campaign with some friends and playing my first game tomorrow. I will be borrowing some mechanised elements from a friend to help round out my force. It will be a pretty standard mech guard list with ccs and vets in chimera. I'm going to try something I don't see in most mech guard lists though, and put hvy weapons in my vet squads and CCS. The purpose being to add long ranged firepower for the first few turns while the chimeras are all lined up and sitting still.

CCS with 2 melta and lascannon, chimera x2 (one has OotF and MoO)
Vets with 3 melta and lascannon, chimera x6
Sentinel w/autocannon x3
Manticore x3

That is 2000 points on the nose. I am thinking of taking out one manticore for two hydras, and then blowing the extra 10 points somewhere. I don't see a lot of lists with hvy weapons in mechanised veteran squads. Am I missing something really obvious and making a big mistake by doing this?

to me what you're missing is all those lascannons add up to 1 Vendetta. drop 1 manticore and you now have 2 Vendettas w/ forty points left to play with.
and as you said, you'll get maybe one turn of using those lascannons before everyone is running everywhere. just my opinion.

The reason why you don't see it is because objective games force you to capture objectives and just not sit back. And melta guns want you to move forward and get as close as possible to the enemy to use them. If your moving you can't shoot the heavys. If your sitting back your Meltas are kinda wasted.

If your going to have static units, I suggest more plasma, like 4 of your 8 units be plasma units.