In Montana the North Tobacco Roots Mountains HD 333 closes the antlered mule deer season on November 15th and has for several seasons. I would be interested in finding out if that closure during the rut has resulted in more mature mulie bucks.
The early closure started in the mid/late 90's if I remember right. Just after they tossed the "choose your district program." The harvest stats show the number of 4pt bucks (3yo+?) taken per year is about half of what it was 10 years ago, from 120, down to about 55. Hunter numbers and effort has remained similar. IMO, the number one reason... they gave out hundreds of doe tags from 2004-2009 and reduced the population.
I have friends and family that have hunted that area for decades. Some who have owned or currently own large tracts of property there. IMO there aren't enough deer in that district for a few to escape the pressure to become big trophy bucks... there is no where to escape to. the genetics/feed like most all of Montana sucks and rarely produce "trophy" class deer no matter how much pressure. It takes a lot of deer for those few with the right stuff to make it to "trophy" status.
I haven't hunted that area in a few years, (maybe 2011), but the access to the best deer habitat is just too easy, as are most areas in the state. Don't kid yourself, the rut is in full swing by the time they close it. There really isn't a ton of quality deer habitat either. The majority of the population is on the north end towards Cardwell, and gets hunted hard... I used to frequent 333 about 20-30 days a year, drive through it 2-3 times a week for years.
There are roads and ATV trails through most all of it, the best deer habitat is private and managed for grazing/ag, poaching runs rampant, road kill is probably in the 200+ animals a year or more (I ran over 3 myself), etc. Also toss in its proximity to Butte, Bozeman, and Helena and you get the picture... too much hunting pressure and humans regardless of season dates.
I don't know if any of you remember the mid/late 90s for 4-5 years when we had to choose what district in SW MT to hunt mule deer and then were restricted to only that unit? It was only for Region 3 if I remember right. IMO, at the tail end of the program (after the FWP considered it a success) and the deer had recovered... the number of mature bucks went from near zero to some of the best deer hunting I'd seen in a long time. They also cut all doe tags. A few years after they ended the program deer hunting turned into what it is today.
I'd like to see them try the choose your unit again, or would love to read up on the studies/conclusion of this program. I haven't been able to find any literature on it.
Something else to keep in mind. Most of Montana doesn't have the genetics or soil minerals to grow truly trophy antlered deer on a regular basis. There are a few exceptions, but not many. Basing management on rack size won't work. There are many mature bucks killed every year that have small racks.