Load Development in High Mirage Conditions

I personally would save it. Especially if you were shooting at a target out past a 300 yard distance.

It makes OCW testing much more inline with your shooting type if you place the target out there to see the nodes where your Match has them. I have been using 700 yards for OCW, fine charge weight tuning and seating depth. Seems to work great for me.
 
I hear ya. set up a target today at 600 going to shoot test loads for a new bullet on paper and after seeing how bad the mirage was I ended up just shooting my old faithful load at steel. Figured I’d save the test loads for a better day