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Sight Click Calculator

Enter where your group sits: as a ring value and clock position, the way you say it on the range ("9.5 at 4 o'clock"), or in millimeters, the way the "MPI Offset" card in Ring Reader shows it. The calculator tells you for common diopters how many clicks to turn and in which direction.

Enter the offset as

SightHorizontalVertical
Typical values
10 clicks per turn0.40 mm per click––
20 clicks per turn0.20 mm per click––
48 clicks per turn0.10 mm per click––
Models
Anschütz 6805/10 (6834)10 clicks per turn · 0.40 mm per click––
Anschütz 7002/1010 clicks per turn · 0.40 mm per click––
Anschütz 7002/2020 clicks per turn · 0.20 mm per click––
Anschütz 801212 clicks per turn · 0.40 mm per click––
Anschütz 802424 clicks per turn · 0.20 mm per click––
Anschütz Precise24 clicks per turn · 0.20 mm per click––
Centra Pro 57 LC20 clicks per turn · 0.20 mm per click––
Centra Spy, Spy Cromo24 clicks per turn · 0.20 mm per click––
Centra Spy Short SR24 clicks per turn · 0.25 mm per click––
Centra Spy BR48 clicks per turn · 0.10 mm per click––
Feinwerkbau (500, 603)0.40 mm per click––
Feinwerkbau (800, 900)20 clicks per turn · 0.20 mm per click––
Gehmann 540 Champion0.20 mm per click––
Gehmann 590 Kompakt20 clicks per turn · 0.30 mm per click––
Gehmann 590-L Kompakt20 clicks per turn · 0.16 mm per click––
Grünig + Elmiger Compact0.40 mm per click––
Hämmerli 460, 461, 4620.50 mm per click––
ProLux3D20 clicks per turn · 0.31 mm per click––
Tec-Hro bi-lux60 clicks per turn · 0.125 mm per click––
Tec-Hro Precise Light20 clicks per turn · 0.25 mm per click––
Walther Insight-Out0.40 mm per click––
Walther Matchdiopter SPORT0.30 mm per click––
Walther Visionic20 clicks per turn · 0.20 mm per click––

The typical values are rules of thumb. The model values come from makers and retailers and apply at 10 m with a long sight radius. On a shorter rifle one click moves the group further: Anschütz gives 0.26 instead of 0.20 mm for a 750 instead of 950 mm sight radius. When in doubt, your diopter's manual wins, or measure the click value yourself.

Your sight is not listed? Enter its click value

The direction is where the group has to go: it sits right, so it must move left. On a diopter or rear sight you turn toward where the group should go, usually marked "L" or "R", "U" or "D". A scope works the same way.

How it is calculated

Ring value and clock position first become an offset in millimeters. The ring value gives the distance from the center, calculated as in the Teiler calculator: an air rifle 9.5 sits 3.50 to 3.75 mm from the center, and the calculator takes the middle, 3.63 mm. The clock position gives the direction, 12 o'clock is high. So 9.5 at 4 o'clock is 3.1 mm right and 1.8 mm low.

The clicks are then the offset divided by the click value, rounded to whole clicks. At 50 m the same click moves the group five times as far as at 10 m. For a scope you enter the click value yourself: one minute of angle (MOA) is about 29.1 mm at 100 m, and one milliradian (mrad) is a thousandth of the distance, so 0.1 mrad is 1 mm at 10 m.

If you cannot find your diopter's click value, measure it: turn ten clicks, shoot two series, read the offset in the "MPI Deviation" view, divide by ten.

When clicking is worth it

You adjust a sight for an offset that sits in the same place across several series. The "MPI Deviation" view in Ring Reader's Analytics shows exactly that, and the "MPI Offset" card on the result page gives you the offset in millimeters that you enter here. Anyone who clicks after every series is correcting the last coincidence.

Read on

In Ring Reader the offset is on the "MPI Offset" card in millimeters after every series.

Take a look