What is the best method for sighting-in a rifle?

Firing the rifle from a solid bench rest is the best method for sighting-in a rifle because it provides a stable and consistent shooting platform. This stability allows the shooter to focus solely on the alignment of the rifle sights and the target without the influence of body movement or a shaky hold, which can lead to inaccurate shots. A bench rest minimizes variables that could affect accuracy, and it ensures that any adjustments made to the sights can be accurately assessed based on shot placement.

Using lighter ammunition than intended for hunting could lead to incorrect adjustments, as different ammunition types can shoot differently due to varying velocities and trajectories. Examining the target and adjusting the sight after each shot, while seemingly logical, can introduce inconsistencies caused by variations in shooting technique or environmental factors that can affect shot placement. Resting the barrel of the rifle on a sandbag may provide some stability, but it is not as effective as a true bench rest setup, which supports the entire rifle and reduces movement, leading to more precise results.