Manual

4
Parts of the Leupold TMR and
Horus
®
H27 Reticles
A milliradian is a unit of measure derived from the degrees of a circle (in a 360
degree circle, there are 6,283.2 milliradians, or 17.45 milliradians per degree.)
This means that a milliradian will subtend different amounts at different
ranges. For example:
The subtension of 1 mil equals 3.6 inches (3.44 MOA) at 100 yards or 36 inches
at 1,000 yards. In metric units, the correspondence is 1 mil equals 10 centime-
ters at 100 meters or 1 meter at 1,000 meters. Knowing this subtension and
knowing the size of the target (or a reference object near the target) allows
the distance to the target to be estimated with considerable accuracy.
The base scale for the TMR is .2 milliradians and the base scale for the H27 is
.1 milliradians. The incremental milliradian values designated by various hash
marks of the TMR are 5.0, 1.0, .50, .40, .20, .15, or .10 milliradians. The fine
crosshair scale totals 10 milliradians per axis, with the addition of a 5 millira-
dian hash mark on each end post for a total of 20 milliradians per axis (TMR).