McRae TerrAssault 2

WNDSN XPD – Grouping-to-MOA Converter

From shot groupings to MOA in one piece-of-string operation with the Wndsn Grouping-to-MOA Converter.

A tool for training and practice, the Wndsn Grouping-to-MOA Converter enables the user to take out the guess work of calculating shot grouping MOA, thereby eliminating mental calculation errors. The device is based on the same principle as other Wndsn instruments, a nomogram; a graphical calculator that requires two inputs (here the grouping in cm or inch and the range distance in m or yd) to compute the output, namely the grouping in MOA. It works by entering the shot grouping and the range distance and read the resulting MOA, all by aligning the provided string across the three scales.

The Grouping-to-MOA converter provides different range scales on the front and on the back of the device respectively; the front is suited from 0 to 100 yards and the back set of scales is suited for 100 to 600 yards (or meters, respectively).

The updated, redesigned version of our Grouping-to-MOA Converter model for 2019 features standardized scales, and higher precision in input and output. It comes with a printed manual with instructions in German & English.

Ongoing research and development of scale layouts allowed us to increase the precision by a factor of 10 in some areas of the logarithmic scale. In addition, the new version of the tool is laser-engraved in acrylic, and hence more robust than the former, printed model. Like all other Wndsn instruments, the Grouping-to-MOA converter is Made in Germany.

The Grouping-to-MOA converterl is available at:

Wndsn navigation tools are available at:

3 Responses to “WNDSN XPD – Grouping-to-MOA Converter”

  1. miclo18d says:

    Or….you could just do head math

    1.85 in group at 75m

    1moa” ~1in at 100yd
    1.85~2 in @100 =2moa @50 =4moa @ 75=3moa

    I get 3 moa they get 2.5 moa, for .5” error I save $25

    • miclo18d says:

      For $25 I can buy the team a beer if I’m the one shooting a 1.85” group at 75 yds

  2. the hun says:

    This is german low-tech genius!
    Our armed forces may have not the capabilities to have navy-Helicopter, which can fly over water or pilots with enough hours in the cockpit to keep up internationally anymore…
    R.I.P. Manfred von Richthofen..
    But our engineers are top-notch,
    but in this case they forgot the “Flaschenöffner”!
    Harharhar harhar