Aren't what accurate? What exactly do you mean?
We spin them up to 40 MOA (.308/175 to 1,000 yards with a 100 yard base zero) and they track fine.
There are some cases in older Loopys where the click values will lose some linearity as large amounts of elevation is dialed on, but this is why we actually shoot long range data and don't rely on computer fantasy for our dope. Once we have our proven data, the click values are reliable and repeatable, part of why these scopes cost around a grand.