If you use a program for shooting it is going to take the atmospheric conditions into the calculation. If you do shoot at 1 mile without the correction it could be enough to miss. Plug different variables into something online a check it out. I snipe or ?
When Grant Notley died in the plane crash it was because he flew into a rise in terrain because they did not do proper adjustment on altimeter to get the proper density altitude. It can easily make a pilot believe he is hundreds of feet higher than he actually is.
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