RE: This is why its called hunting and not getting!
maximum shot distance is asubjective thing. Weather, wind,equipment, available light(to see small branches) all come into play but the overwhelming factor is the attitude of the deer.
IMHO, the best situation is a rutting buck that is intent on a doe or an intruding buck. He will often fail to react as quickly as even a relaxed feeding deer. I've even had bucks in that situation react toa double lung hitwith nothing more than a jump or two only to look back ready to retaliate at the buck that must have hit em in the ribs.
Shots at awired deer that has either busted you or simply suspects something is wrong should be kept under 20 yards and far less is even better.
When asked by a new hunter, or working with kids, my advice is to find the maximum range where the hunter can place 5-6 arrows out of 6 in the kill zone of a target and cut it in half to come up with a max shooting distance at RELAXED, UNHURRIED deer.