Greenhorn, some of the younger smaller bucks come from the Milk River. We can't manage mule deer here, a 5..5 to 6.5 yr. old mule deer is as common as a unicorn. To much public land to manage mule deer here in Reg. 6. There is not one ranch that can consistently grow mule deer to maturity....the ranches here are just not big enough...those that are big enough have to much interspersed BLM w/ access to grow deer consistently(the key word).
The other better deer and obvious management deer come from the Powder River. Here we average 5.5 to 6.5 years of age depending on the year. Every year we take 2-3 7.5 year old deer, and this past season we took a 9.5 year old buck. We average around 170-175 gross on these deer. This is about where we see most of the bucks "max" out, every year we take 1-2 bucks that are right in the 188-190 gross range. In 15 years down there we have never taken a 200. We just do not have the right soil type, woody browse or agriculture to produce 200+ bucks there. If the landowners were farmers and growing soy beans/garbonzo beans/peas, ect, then I think we would see a 10-20 inch jump in antler growth....but this is ranch country, and we take what we get. (the deer are from last 2-3 yrs., no way we could take 50 a year)
JLS is right (sorry you are disappointed I come close to the truth...LOL) The Diamond Cross consistently produces top end 190-200 inch bucks...superior soil types and abundant woody browse contribute to their great management program. The other areas that are consistent about producing top end are Sarpy Creek and the Colstrip areas. Not every area is created equal when it comes to antler production.
The other thing JLS hit on is also correct(imo), 20 years ago, if you hunted hard taking a 170-190 buck was a realistic possibility on public land (at least here in Reg. 6). Now, you if you are lucky you might get one once every 4-5 years.