Term used to describe the measure of a bullet’s fall after it crosses the line of sight for the second time, i.e., beyond the zero or sighted-in range, due to the effect of gravity.
Bullet drop is the name given to the tendency of a bullet to drop in flight due to the effect of gravity. It is important to understand the ballistics of a given cartridge when zeroing the weapon. For example, Hornady lists a bullet drop of 42.40 in (1.076 m) at a distance of 500 yards (457.2 m) for a .30-06 rifle zeroed at 200 yards (182.88 m) https://www.hornady.com/shop/?page=ballistics/popup&product_sku=8518.