LDB and I have debated this one for a while...I did talk to an outfitter here in Saskatchewan that weighs everything that comes in....according to him the guts on a big buck will be around 40-45 lbs. the most weighing 47 lbs. the biggest deer that he has weighed was 275 lbs. and was a PIG...talking with another outfitter that does the same in terms of weighing once weighed a elk-sized deer that came in a hair over 400 lbs. on the hoof....I am getting one of those deer scales for LDB so we can be a little more accurate in terms of live weight to meat yield...we bone out all our own meat...and the .33-.35 is what we think is pretty fair...