It is different everywhere and for everyone, but where we hunt in Northern Saskatchewan, usually 160" is the mark to beat. 150"ers are relatively common for mature bucks. Of course, if you have a massive old buck who doesnt score up but is very cool, you take him. By the same token, if you have a 165" light horned young buck, you let him walk recognizing his potential. So many factors, but the number really isnt that important, IMO.