I will disagree with the EASILY part. Yes, on a day when the atmospheric pressure is low and there is no wind and little humidity and you are aiming up but shooting down a slope with no obstacles you MIGHT make a mile long shot with no accuracy. However, under normal conditions the bullet will slow and gravity will pull the bullet to earth considerably short of a mile.
@DeepCMark58A, yes, easier to skip the math and shoot at close range with a 20ga low brass or an air rifle, or any of the handgun loads in bird shot.