If you are going to attempt to sight in
your rifle scope for hunting or just shooting, you will need a basic
understanding of what a Minute of Angle is.
Think of a circle as it is divided into 360 degrees.
Each degree is divided into 60 minutes.
Each minute is divided into 60 seconds, but we don't use that for ballistics, seconds of angle are just used in machine shops and in rocket science.
Minute of Angle
1 MOA = 1/60th of a degree
1 MOA = 1.047 inches at 100 yards
Most accurate long range scopes are set in quarter clicks (4 clicks = 1 MOA) or eighth clicks (8 clicks = 1 MOA) but less accurate short range scopes are sometimes set in half MOA clicks (2 clicks = 1 MOA)? which to me is the opposite as it should be.
For a .308 the difference between shooting at 100 yards and at 500 yards is about 11 MOA. That adjustment with a scope using eighth clicks is 88 clicks.
Most accuracy testing is done at 100 yards, because it makes the math easier, and it is close enough to see the bullet holes through a spotting scope.
Folks usually say that 1 MOA is equal to 1 inch at 100 yards, which is almost exactly correct, as 1 MOA is only slightly more than 1 inch at 100 yards. But for what we are doing it is close enough. Now think it on out to 300 yards, 1 MOA is then equal to 3 inches. So if your shots are 1 inch off to the left at 100 yards; out at 300 yards, you will be off to the left 4 inches. Clear as mud? Hope this helps.
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