Was out yesterday popping-off a few rounds to test the feel of the two-stage trigger in my latest Evil Black Rifle. My friend JR was there to test the zero on his rifle but he did not shoot because the sky was brightly overcast, and he said the bright but flat lighting would cause the bullets to impact an inch higher on a clear & sunny day. I find this hard to believe. I have to ask, "How does the bullet know it's traveling under a clear and sunny sky, versus an overcast sky that is still bright enough to trip the sensors of a chronograph? If the bullet is aware of its own existence, how can the lighting cause the bullet to gain altitude between the muzzle and the target?" JR is an old-schooler from Hartville, Missouri. He's just about 82, has his beliefs and stands by them. If he believes something, you'll be unable to dissuade him without regard as to how much evidence you have to show him he's wrong. Any truth to the bullet rising between the muzzle versus succumbing to the power of gravity because of the lighting conditions at the time of the bullet being fired?