I have one, and have yet been able to shoot out past 200yds. The directions in the box say that for a 22-250 or similar caliber (shooting around 3750 fps) that the main duplex should be sighted in at 200yds, and then it is 300, 400, 500 etc... Not sure if the windage marks are right or accurate. I have the 4.5X14 and the scope itself is great. But like I said, haven't been able to confirm the reticles and wether they are accurate out to 500yds.