MOA =, keep forgetting?

[TreeHugger]

1 MOA at 100 yrd = 1"

What about

200 yrd?
300 yrd?
etc.

[Nathan Krynn]

2"
3"

[Omega13device]

1 MOA =

2" at 200
3" at 300
4" at 400

and so on.

[dousan]

I'm on a cell but what is the amount going metric (meters)
Xx mm or cm=100 meters


Thanks

[Hoologan]

Then use mils.

[i1800collect]

I'm on a cell but what is the amount going metric (meters)
Xx mm or cm=100 meters


Thanks

2.908 centimeters = 1 MOA at 100 meters

[rero360]

Then use mils.

Not true, Mils are not exclusive to meters or any other form of measurement. Mils are simply a subtend measurement of a Radian, similar to degrees, the cutting up of the circumfrence of a circle in equal distances. In Artillary Mils, there are 6400 mils in a circle, where as in mils that are found in rifle scopes it is something like 6248, I forget the exact number.

While MOA is great in that just about everyone knows it and pretty much understands it, it leads to confusion as there are three different forms, MOA, True MOA, and IPHY (inch per hundred yards) While all of these are very similar, and the differences are so small as to not matter in distances short of 600 yards unless you are a benchrest shooter, Using Mils is so much easier.

Think about this, you have a scope that has 1/4 MOA turrets on it, shooting a target at 730 yards away. Your first round is off the target, but unless you have a reticle that allows you to measure that distance you kind of have to guess. Now lets say you have a reticle that are Mil dots (pretty common) according to your reticle you are 2 Mils high.

So now in order to figure out what to dial in we need to figure out the distance the shot was off by, since we know the range and the number of mils we can use the Mil ranging formula to figure out the length of the distance at the target we missed by. assuming you are unable to go out and measure the distance up close.

The formula is height of target (distance we need to correct) in inches divided by size of target in Mils multiplied by 27.77 equals distance to target.

Since we know the distnace to the target is 730 and the mil size is 2 we can then figure out the inch measurement. first we divide each side of the equation by 27.77 thus making it X (what we are looking for) divided by 2 equals 26.29 (rounded up)

Then we multiply both sides by the number Mils (2) to get the final answer, being 52.57. Thus our first round missed the target by being 57.52 inches high.

Now we need to figure out how many clicks to dial in, we take the 52.57 and divide that by 7.3 and we get a result of 7.2 thus we are 7.2 MOA off of the target, then take that and multiple by 4 and we get 28.8 or 29 clicks that we must dial in to the scope to bring the POA and POI together.

However, if you have a scope with Mil turrets and a Mil reticle, then all that math goes bye bye, same scenario, you are 2 Mils high, you dial in 2 Mils on the turret and fire away, and if your turrets are 1/10 Mil then you would dial in 20 clicks.

Granted that regardless of the click values of the turrets, it you have a reticle like the Mil dot you can make very fast and pretty accurate hold overs to make those corrections instead of dialing it in.