Nonetheless, both are equally effective, using segments of arc to express a certain amount of change in trajectory at a set distance. The Milliradian method is a base-10 scheme developed for artillery in the late nineteenth century. ![]() The Minute of Angle (MOA) method is an ancient base-60 scheme conceived for astronomy. Each has a distinctly different origin and approach. Two systems for aligning scopes have developed independently. Scopes have evolved with greater clarity and magnification to match the increasing power and precision of rifles and ammunition. In this article, we will focus on telescopic sights or “scopes” because they offer significant advantages over open sights, especially at longer distances. Sighting in or “zeroing” a rifle is the art of aligning iron or telescopic sights with the barrel, thus allowing the shooter to place bullets predictably at a given distance.
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