The guy might get that much meat, if the buck was about TWICE the size of a very large whitetail buck!
Seriously, there is no way possible to get that much meat off a deer. To get 170 lbs of meat, the deer would have to weigh well over 400 lbs field dressed. No deer gets that big.
http://www.butcher-packer.com/index.php?main_page=document_general_info&products_id=331
I’ll take your word for it. Guy said it weighed in at 250 pounds undressed and the rest was an estimate.
The boy will receive some type of pat ch from the state of Maine for his kill. Recognition of some sort which is really nice for a boy that age.