Abstract: A method and apparatus for improving the accuracy of a telescopic sight used on a projectile weapon. The method allows an individual to effectively and efficiently “sight in” their firearm sight based on performance shot pattern in a target at pre-determined range values. The method utilizes a series of static gauges that represent uniform incremental indicia thereon that correspond to telescopic sight range adjustment input values. The gauges are placed on the target to indicate the required adjustment to be made to achieve an accurate shot performance at a given distance.