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...up there 30 FEET up a tree. ...
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If you haven't practiced from that high you might want to try and figure out how to get a couple of practice shots in...else using the hoizontal distance from you to the deer instead of the total distance is pretty close to the truth. I.e., if you are 10 yards up the tree and the deer is 15 yards away from the base of the tree, then use a 15 yard pin. beprepn