This concept refers to the process of adjusting a firearm’s sights so that the point of impact of a projectile coincides with the point of aim at a distance of 25 yards. This specific distance is frequently used as a preliminary step in achieving a longer-range zero, often at 100 yards. A visual aid, typically paper or cardboard with graphically marked aiming points, is employed to assist in this process. The shooter fires groups of shots at the target, making adjustments to the sight alignment until the point of impact matches the desired aiming point.
Establishing this initial short-range benchmark provides several advantages. It allows for gross adjustments to be made quickly and efficiently, minimizing wasted ammunition and range time. Furthermore, it establishes a foundational platform for fine-tuning at the desired longer range. Historically, this method has been used by military and civilian shooters alike to ensure accuracy and consistency in their firearms. The practice remains a cornerstone of marksmanship fundamentals, ensuring predictable projectile trajectories.