In my humble opinion it is an unnecessary distraction. Your time would be better spent watching the wind flags [if any]. If there arent any wind flags you'll need to watch the trees, weeds, gunsmoke etc, make your sight corrections, lock into your rifle and start your shot sequence and get the shot off before conditions change. I've always tried to keep things as uncomplicated as possible because the condition you liked could change in 5 seconds and frequently does. I have personally never had a problem getting the horizontal crosshair level. Remember..........natural point of aim, SIGHT PICTURE, breath control, trigger squeeze, follow through. Old school basics. X