Bend at the waist, pick a hair and give it to em.

23 yards from the tree is 23 yards from the tree...the difference in a range finder and the pythagorean theory is what, (we had the chart here some time ago), less than a yard, two at the most depending on extreme heights....in a hunting situation you can't shoot the difference, worst case, pick a hair under the hair you were going to shoot and remember to aim for the exit hole.