Hate to answer for him, but I bet its for the same reason I don't. You have to go out and experiment and use your power adjust for each range. For instance, you might have to use 8 power for 300 yards, and 10 power for 500, or vise versa. Thats my reasoning. I rather have mil-dot. I kept mine, and still havnt got to go out and see where it hits at 300 or more. But I plan on keeping mine on 12 power and just knowing where it hits like first circle, 320yards, and second 450, etc.