Joe D., Read "Sniper" by Adrian Gilbert, I want to say chapter 7, but I'm not sure....bullet "Rise" in hot weather does honestly occur, but it isn't the bullet that's rising, it's the image of your target. It's called known as a mirage, and pretty accurately so. The hazy lines you notice on the roadway occur over all sorts of land, just to a lesser degree. The heated, rising air bends light, so what you're seeing isn't exactly what you're looking at.

Mirage can also be used to calculate wind speed, adjust your scope slightly out of focus and you can clearly see the mirage "lines" or waves, in a good wind, they'll be leaning one way or the other, I can't recall right now where exactly you're supposed to aim relative to the lines though? It's not even with the bottom, it seems like there is a rule of 1/4 in there somewhere?

Read military sniper manuals or shooting books written by retired snipers and you'll find a wealth of information.

Mirage and magnus effect are minimal, most hunters will never notice them in their lifetime, because the change in relation of POI and POA over typical hunting ranges isn't enough to take your bullet completely off your deer. Most guys will attribute a miss at that range to their "accuracy" or the wind, not to the smaller ambient environmental effects.