Make mirage your friend..... cause it is. For LR shooting, mirage is a critical aid in figuring out your firing solution and adjusting for the changes that will happen.
If shooting on a range, flags are nice but aren't everywhere and may "lie". Mirage almost never does.
If you want to use high mag scopes, mirage is a part of life. Better scopes with better glass can help here alot. Sightron being the entry level of quality glass and solid tracking. From there you can go NF, S&B, March, etc.
Those that compete in F class out to 1000yds, will have their scopes set at 30X to 55X. The better scopes still pick up mirage... just the image is still useable. I shoot at 32 to 35X and let the changes and intensity of the mirage tell me what the air is doing...
Many times, when you loose info the mirage provides, you also loose the ability to make precise and subtle adjustments to the aim and that costs alot of misses.
At the AB provincials last summer, conditions were mild but there was a switching wind of about 1/2 to 3/4 min. The flags were dead and nothing really showed the changes except the mirage. I was able to see the mirage, shot a clean relay with high V count at 700m. A very good shooter on my relay just kept getting caught on the switches and dropped a bunch of points. Afterwards, we chatted and I asked if he saw all those switches... Nope, couldn't pick up the mirage.
Those points likely were what put me into the lead and the overall win.
Mirage IS MY FRIEND!!!
Jerry