Air density and bullet travel
While this is my first full year of being trained to shoot long range 700-1100 yards, along with reloading, reading the wind, air temps ect. I have a question on air density and sound travel. When I can hear cars for miles away [light air density] my bullets shoot a minute low a 9 hundred yards, when there is no sound travel to be heard I shoot a minute high, this goes against what i've read, doesn't heavy air slow a bullet? This is usually around sundown.