Rezeroing

Rezeroing is the process of adjusting the alignment of a sighting system so that the point of aim corresponds to the actual point of impact at a specified distance. It is used with firearms, bows, and other optical devices, especially after equipment changes, maintenance, or environmental shifts that may alter ballistic trajectories.

In firearms, rezeroing typically involves firing a controlled group at a known distance, measuring the deviation between the point of aim and the point of impact, and adjusting the sight's elevation and windage turrets or the optic's reticle until the POI matches the POA at the chosen distance. Common practice is to establish a primary zero at a standard distance and to verify at other distances as needed. For optics with adjustment increments (quarter-MOA or milliradians per click), adjustments are made in consistent units and rechecked.

In archery or other projectile systems, rezeroing follows a similar method: shoot at a known distance, assess where the arrow lands relative to the pin or reticle, and adjust accordingly. Rezeroing may be necessary after changing components, ammunition, or after environmental changes such as temperature or altitude.

Documentation is advised: record the zero distance, the ammunition or arrow type, optic model, and turret or reticle settings, so future re-zeroing can begin from a known reference. Proper rezeroing procedures help maintain accuracy and ensure consistent performance across varying conditions.