Can you kill a deer in the neck with your bow? Sure. Sometimes. Can you kill a deer in the lungs with your bow?....Yes. Nearly every time. Huntig is always (or should be)about taking the highest percentage shots, only. I can PROMISE you, you will lose/ cripple more turkeys if you start shooting for the body, no matter what shot size you use. Several friends who hunt here in PA's fall season with rifles, lose considerably more birds than I ever do using a shotgun. If they can get up and fly/ run being hit through the body with a .223 or even a .243, rest assured that even large diameter shot will lose birds just as often. Head neck doesn't leave alot of margin for crippling. Usually the bird goes down and stays down, or it's a miss. That is also why I favor the guillotine style broadheads for archery turkey hunting. Miss, or stone dead. That should be our goal every time we hunt,no matter the weapon or the species. If you put in your homewrok, your gun should be able to find a load that will be absolutely lethal in the head and neck >99% of the time at 40 yards (if you do your part with shot execution, keeping your cheek down, sqeezing the trigger, lining up the sights properly and waiting for the right time to shoot). Hope this helps.