I had a 4x20 on my 223 last summer, in the middle of the day on side winds I had to turn it down. I had a 4x16 on my 22-250 and do not recall any mirage, but there was a noticeable difference when shooting 300+. The reticle does make a difference, the 4x16 was a Nikon bdc terrible for prairie dogs. I need to replace the Nikon for next summer's shoot, was thinking 6x18 fine duplex or the Leupold wind plex.