Patent ID: 7603804

Claim:
A method of aiming a gun with a riflescope, comprising the steps of: (a) displaying, via the riflescope, a primary aiming mark indicating a primary aiming point; (b) displaying, via the riflescope, a plurality of secondary aiming marks indicating secondary aiming points spaced apart below the primary aiming point along a vertical axis intersecting the primary aiming point, the primary and secondary aiming points subtending preselected angles therebetween at a first optical power of the riflescope so that the secondary aiming points are useable to compensate for ballistic drop at preselected incremental ranges beyond a first range of the primary aiming point; (c) sighting-in the riflescope at a predetermined first range so that the primary aiming point is superposed with a nominal point of impact of a projectile shot from the gun at the first range; (d) loading a selected ammunition into the gun; (e) adjusting an optical power setting of the riflescope until the angles subtended by the adjacent aiming points correspond to the selected ammunition; (f) determining an observed range to a target after sighting-in the riflescope; and (g) aligning the gun so that a primary or secondary aiming point corresponding most closely to the observed range is superposed over a desired point of impact on the target.