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Front sight adjustment calculation

Vetterli M1881 Stutzer

There is a complex formula to calculate (thanks Parashooter). 

The calculation works like this: Divide the amount of group movement desired by the target distance times the sight radius to get the amount of front (or rear) sight change needed. The sight radius is about 0.8m, so if you want to move your 100m group 0.50m - divide 0.50 by 100 x 0.8 to give 0.004m. Therefore a 4mm sight change would be needed. But if you instead add 5, 6 or 7mm to the height of the front sight you gain the option of adjusting the rear sight down if needed - without having to start over again with a taller front sight. I have never found a need to measure the height of the Vetterli front sight - I suppose it depends on which model of Vetterli it's on. A post that sticks up about 6mm higher works for me and that's all I really have to know.

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Conception & Realisation: Collani Interactive