Not as yet.... Just saying lol. Its also the same for every other animal, always moving, heads/necks... This doesn't just apply to deer but people seem to miss that. Go onto the aussie/nz forums, with respect, if you can reliably and consistently then whys it a bad ideaI'm sure this thread is going to get a million different views ranging from "if you can do it then crack on" to "outrageous - shouldnt ever be done".
The fact is that the head and neck are the most mobile part of a deer, and are small targets compared to the chest area. You're increasing your risks of a wounded deer taking head/neck shots, and then increasing them again by pushing the range out.
I would suggest that someone consistently taking longer range (lets say 200y and up) head/neck shots at deer will lose or miss more beasts on average over time than someone who aims to get under 200y engine room shots.
Personally the longest shot I've ever taken is about 250y, in general I aim to get under 200y and prefer engine room shots.