I guess it's not the most effective, but it CAN save ammo, and it's my favorite. Even though I usually miss twice. I don't usually snipe, but I don't try to use headshots exclusively, either. So Ranre, to clarify my position, my favorite way to euthanize the AI bot is to take my trusty Blaster Rifle, tatget them as I am running towards them, and open fire as I close in hoping to clean the head off as close as possible for maximum effect. It's really fun.