I have some "high powered" (24-32x) scopes for my PD rifles and find that as the day heats up, the higher powers (18x+) tend to be more affected by heat mirage than the lower powers and need to be turned back.
My best all-around scope for the high sun and 300yd+ shots is my Sightron S-II, 4-16x Mil-Dot...it's super clear and the mil dots help with my hold overs on the longer shots with my .204 AR..
It also lets me have more of a chance at seeing any carnage with the back flips...due to the wider field of view..
