I would say maybe 100 or less. A 150 is a freak of nature. Another thing, many guys see a huge buck and right off the bat its "gotta be at least 150". Seems whenever someone is describing a big buck to me they say "it was at least a 150. Most mature bucks are 8 pt.s and it takes one hell of an 8 to hit 150. I shot an 8 last year that was 23" outside and 20" inside heavy and long mains and tines and it grossed 145". The only 8 I have seen that grossed 150 came from Texas. Most 150 class bucks are gonna be 10 pt.s or better simply due to the addition of scoring two extra points. I think most hunters grossly overestimate buck scores. Saw a guy checking one in at a WMA years ago and several guys were guessing it scored "over 150". Biologist there green measured it and it grossed 127! And that was a huge buck!
