It doesn't work:
http://www.createstrat.com/muledeerinthewest/harvest.html
"Antler point restrictions
Creating mule deer harvest seasons with antler point restrictions is popular amongst hunters who think it will help increase the number of mature bucks and buck:doe ratios in mule deer populations. But research in many western states shows that antler point restrictions do not produce more deer or larger-antlered deer.
Colorado implemented antler point restrictions statewide for six years, and in a number of game units for seven years. The result was a shift of hunting from pressure on all age classes of bucks (primarily yearlings) to bucks two years and older, and an increase in illegal or accidental harvest of yearling bucks. The number of mature bucks did not increase over time.
Idaho and Montana implemented two points or less seasons to reduce hunting pressure on older bucks and improve buck:doe ratios at the end of hunting seasons. Over the long term, two point seasons did not improve buck:doe ratios at the end of the hunting seasons.
Wyoming?s experience with four point or better seasons resulted in fewer hunters and a reduction in total harvest, fewer mature bucks, and a significant number of deer harvested with fewer than four points.
Utah abandoned efforts to implement antler point restrictions after five years when officials documented illegal harvest, reductions in overall harvest and fewer mature bucks.
Attempts to increase the number of mature bucks and buck:doe ratios using four-point seasons in Montana reduced buck harvest by 28 percent, increased illegal harvest of bucks with 3x3 points or less by about 40 percent, and increased harvest of bucks having more than 3x4 points.
Washington tried antler point restrictions in a few of their hunting units and experienced a smaller harvest of mule deer bucks, a switch in harvest from mule deer to white-tailed deer, and no increase in the number of mature bucks. They did experience an increase in buck:doe ratios because of the lower buck harvest and improved recruitment of fawns.
Oregon abandoned antler point restrictions in a few popular hunting areas when the number of older bucks and buck:doe ratios decreased after 12 years.
Most western states have concluded that changes in buck:doe ratios and increases in the number of mature bucks can only be accomplished through reductions in harvest of bucks."