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I feel like this might have been asked before and I hate myself for asking again

If Warrior Henchmen from Ordo Hereticus have Targeters and Plasma Guns

He measures ahead of time and finds that all the Plasma Guns are out of range, but the Heavy Bolters on the Servitors are in range

Can you choose not to fire the Plasma Guns and only fire the Heavy Bolters?

Yes, that is the point of premeasuring