From a treestand the difference between 10 - 20 yards is minimal, say 1" or 2", depending on how high you set your treestands.I calculate mostof the distances from 25 feet high. Lower elevationsshould minimize the difference. If you want 25 yards, you probably need to sight in from the ground and then the treestand elevation will make the shot a little high, but now noticeable, in a perfect scenario based on the math at 25 feet up in a tree, 1.15". I have a excel spreadsheet that I use to calculate the true distance based on height.