A boresighting device aligns the sighting system of a firearm with the barrel’s bore. This preliminary alignment, typically performed before live firing, offers a significant advantage in minimizing the adjustments needed on the range to achieve accurate targeting. For example, when mounting a new scope on a rifle, using this tool drastically reduces the amount of ammunition spent zeroing the optic.
The primary importance of this procedure lies in its efficiency and cost-effectiveness. It conserves ammunition, a crucial benefit considering the cost and availability of certain cartridges. Furthermore, it saves time on the range, allowing for more focused practice and refinement of shooting technique. Historically, simpler methods involving visual alignment down the bore were used, but modern tools offer greater precision and ease of use, contributing to a more accurate initial setup.