Trajectory
The arc a bullet follows from the moment it leaves the muzzle until it hits the target. Gravity bends it downward; wind pushes it sideways.
A bullet starts dropping the instant it leaves the barrel. The faster it’s moving and the higher its BC, the flatter the arc looks. At 1,000 yards a typical 6.5 Creedmoor load drops over 25 feet from line of bore.
Modern ballistic calculators predict trajectory to within a click or two if you give them honest muzzle velocity and atmospherics. They still cannot read wind for you.