A poorly placed shot at the vitals could also render a wounded deer to suffer being eaten alive from the hind legs forward by yotes. Just another thought. I shoot a 180 grian 300 win mag, and I still shoot them in the head, but I have plenty of other options if the head does not produce a clear shot or if its a mountable buck.
The heart lung area on a typical deer when broad side is about 12 x 18 inches. The vital area of a head shot is about the size of your fist. A deer also moves it's head around much more than they move their torso. It's much more likely that their head will move just as you pull the trigger and you're shooting at a much smaller target to start with. I'm just saying your more likely to get a humane kill when you're shooting at the pumps.