A reticle of a projectile weapon aiming system such as a riflescope
includes a primary aiming mark adapted to be sighted-in at a first
selected range and further includes a plurality of secondary aiming marks
spaced apart below the primary aiming mark. The secondary aiming marks
are positioned to compensate for ballistic drop at preselected
incremental ranges beyond the first selected range, for a selected group
of ammunition having similar ballistic characteristics. Angles subtended
by adjacent aiming marks of the reticle can be adjusted by changing the
optical power of the riflescope, to thereby compensate for ballistic
characteristics of different ammunition. In some embodiments, the reticle
includes a set of windage aiming marks spaced apart along at least one
secondary horizontal axis intersecting a selected one of the secondary
aiming marks, to facilitate compensation for the effect of crosswinds on
the trajectory of the projectile.