The "boiler room" is high in relation to the rest of the turkey's body. If they are broadside, I line up with the leg, and go up to three inches or so below the back. If you are low, you break a leg or hip, high you break the spine, on the money you get the lungs. I've never shot one that was facing me, but I would aim between the beard and waddles. Also, I would make adjustments if the bird was facing but turned slightly by aiming off to one side or the other. The lungs are a good distance back when facing from the front and you would need to account for the angle if the bird was not facing exactly square to you. This is why I rarely bowhunt turkeys anymore. There are a LOT of places to hit one that looks perfect but isn't.