I prefer to shoot an old, mature doe -- and the best way to do it is NEVER shoot a doe that's alone unless you're positive its a big one. Does usually travel in groups of 3 or more, so wait 'til several are around and pick out the biggest one. Statistically, one out of every 3 yearlings shot ends up being a buck - so let the little ones walk. Look for pot bellies, square bodies, and long noses