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T R Robb Airgun Specialist

Range Graph

Get to Know Your Gun

If you want to know your gun a lot better, then it is best to do a range graph. This is fairly simple, and all you have to do is get a safe range of 50 metres or yards.

Zero the gun at your normal range, this is normally around 25 to 35 metres, but this is up to you, depending on the power and maximum range that you shoot at. Let us assume the gun is zeroed at 30 metres.
Copy image below and past into Word to get the full size and print it landscape.






After you have zeroed your gun at your normal zero you then fire still at the centre at 5 metres, then 10 metres, 15 metres, 20 metres etc out to the max range you have decided on, until you have fired at all the five metre points. You then transfer the group drop or rise on this graph. It is then simple to join the dots until you have done your range graph. Get to know the graph well until it comes automatic for you to know the rise or fall of your trajectory.

For example using the graph above you know that at 30 metres you just aim dead on, and at 25 metres you would aim nearly half an inch higher assuming that you are using a quarter inch grid lines, but these can be what ever suits the power of your gun. If your gun is low powered then the grids could be half an inch. Write on the chart what you decide.

You would put a mark on the crossing point of the graph, I have shown a rough idea on the graph above to give you the general idea. The weaker the gun then the more the curve will be, obviously the more power the gun has then the flatter the curve will be. This curve is what we call the trajectory.

A .22 Long Rifle subsonic Bullet shoots fairly flat up to 80 metres, but from 80 metres to a 100 metres they drop about four to five inches.