I have been in the market for a new spotting scope. I think I have it narrowed down to 2. One of them is the Leupold 12x40 - 60. The other is a 20x60 - 60. Those of you that glass a lot for muleys from a half mile or more, is the 12x40 not enough power to see tine length and all the extras on a buck? Should I go with the higher powered scope? Thanks.