Here in NY, I stand about a 50% chance of drawing a doe permit where I hunt each year, and can use my muzzleloading stamp during a one week period. Only being able to shoot a buck (when opportunity presents) and potentially one doe, I try to make my meat shot count. Every area is going to have its own standard as what constitutes a shooter, with size relative. The easiest way to gauge size is comparing several at one time. Generally, the heavier the body looks the older. A gray mask is a good indicationof a mature doe. It isnt unusual to find a 160-170 lb doe around, especially in more agricultural areas.