Rifle Scope Cheat Sheet

This is an interactive spreadsheet to generate a printable, portable cheat sheet to aid you in estimating distances and sizes via a mil dot reticle on a rifle scope. Parameters in the spreadsheet can be adjusted to match the magnification power that your scope manufacturer specifies to use when estimating with mil dots, as well as the magnification power you tend to actually use during rangefinding and target sizing.

Note the reticle to the right is of the round dot, 0.2 mil variety. But 0.25 mil dots are also common. So in that case, read between columns in the table for fractional measurements. Or you insert new 2.5 and 7.5 mil columns into the spreadsheet, scaled for 0.25 and 0.75 mil dots.

# Instructions for use

1. Measure your target (or a distance on a paper target) in mils, through your scope at the magnification indicated on the upper right of the card.
2. Find the corresponding mil column on the card.
3. Rangefinding: if you know the actual size of the target in inches, find that size within that column and read across that row to determine the distance to the target in meters.
4. OR, target sizing: if you know the distance to the target in meters, read across that row to intersect the mil column and determine the actual size of the target in inches.

You can multiply or divide any row, column, or cell to extend the card's range. Shifting the decimal is easiest, obviously. Examples:
• 150 m and 200 m ranges can be read from the 15 m and 20 m rows by multiplying the inch measurements by 10.
• A target size of 0.5 mil can be read from the 5 mil column by dividing the inches by 10
• Rangefinding: Target is known to be 40 inches high and measures 4 mils high in the scope at 25X. So the 4.09 inch size is close in the 4 mil column, when multiplied by 10. That's on the 65 meter row, so one should estimate the range to target as slightly less than 650 meters.

# Sample output

mildot_10_25.pdf
(That PDF is an example; it may not be appropriate for your scope or application so use the spreadsheet, below.)

An Imperial (yard) version of the card is also included. OpenOffice.org or compatible spreadsheet program is required to read the file below. Alternatively, here are pre-rendered versions for a scope used at 25X magnification that is calibrated to use mil dots at 10X magnification.

# History

 2009-02-03 Darren Stone Created.