Here is some info from Zeiss
" The opening between the two horizontal corresponds to 32 inches at 100 yards with the 3-9X40 MC model and at 5X power. This corresponds to 89 cm at 100 cm. In the 3.5-10X44 MC and 4.5-14X44 MX models, these dimensions are obtained on 10 X power. The six horizontal lines provided in the quadrant on the bottom right can be used for estimating ranges. ( 1 = 100m, 2 = 200m, 6 = 600m) The distance between the center line and the different horizontal lines is used to determine the range: if a 50 cm high target covers the distancefrom the center line to the lowest line the distnace to the target will be 100m. If the same target (with a height of 50 cm) only covers the distance from the center line to the horizontal line marked by 3 then the distance from the target is 300m."
Now in laymen terms
The 32 inch measurement is really irrelevant. It does not factor in to the range estimation in any way. The concept was really designed to be used mainly for hunting to determine a ruff estimation of range for a deer. The 50 cm measurement is roughly 20 inches which is the size of the brisket on your average deer. This ZRF reticle is designed to really only range a target 20 inches in height. So basically if you have a 4.5-14x44 scope put it on 10X. Now bracket the brisket of a deer with the given horizontal lines. Now read the # beside the line that is at the bottom of the brisket. Add two zeroes then bam you have your range. It doesn't matter what caliber you will be shooting. The reticle is not calibrated for any specific caliber. It can be used on all types. As it is strictly a feature within the scope to calculate range.
Edited by Brady