The guy above me speaks the truth.
Basically, Heavy Weapons at leader/synapse units and weight of fire at the little bugs.
I am a Codex Marine player like yourself. I always try to focus on any synapse/cover save providing creatures that I can with my heavy weapons, and then just get a ton of bolter fire onto the closest Hormagaunt/Termagaunt units. If you hit the little 'nids with a ton of wounds, they will go down. Flamers, Heavy Bolters, and Missile Launchers are great weapons to have in your list to deal with Tyranids. I get my flamers in my Tactical Marines and HB/ML on a pair of Typhoon Speeders. Weight of fire from these types of weapons can turn that 30 bug unit of gaunts into a non-existent unit of gaunts in short order if you can prioritize your targets. Also, consider a buffering unit, like Assault Marines, to be able to toss out and charge a dangerously close unit of the Hormagaunts in order to tie them up and give you another round of shooting.
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