moa question

[wthrbyman]

I am wondering, does moa change for different calibers. Say for example I put a scope on a 270 wsm and I am shooting 2 inches high at 100 yrds. That would mean I would have to move the elevation 8 clicks to adjust for center. Then say I put the same scope on a 30-30 same scenario. will 8 clicks still equal 2 inches. Does bullet velocity play a part in moa? just curious.

 

[myfriendis410]

Yes it will adjust the same. No, bullet velocity does not play a part. It will however change the trajectory so that the drop out past 100 yards will be different.

 

[eoats]

As I understand it, MOA = Minute of Arc, which is an measurement of angle.
No part of speed or force.

There are 60 Minutes of Arc in one degree of angle, its roughly 1 inch at 100 yards.


There are some good youtube videos about it, here's one:

https://en.wikipedia.org/wiki/Minute_of_arc

 

[wthrbyman]

cool. thanks.

 

[inchr48]

The scope adjustment is the same in either case. However if you took the scope off the 270, and it is +2" at 100 yards. Putting it on the 30-30, it may be -2" or more at 100 yards since the second caliber has much slower ballistics. The adjustment to zero would be the same in each case however.

 

[Bubblehide]

Tehes guys pretty much answered it. But to be a tad clearer, your looking at two different things: 1). MOA, and 2). bullet trajectory. It sounds like your trying to put the two together at distances other than what your particular weapon is sighted in for. For this, knowing your particular cartridge trajectory is essential, as is know the scopes MOA, generally 1/4" at 100 yards. However, because MOA is taken from a central point (the barrel), and goes out at degrees. Think of it like a protractor; the farther from the center point you get, the farther away the degrees are from each other. So, lets say that your cartridge matches perfectly with the MOA at 100 yard intervals. If this is the case, 4 clicks of the elevation would zero you at 200 yards, 4 more clicks at 300 yards...Unfortunately, it's not that simple. What you have to do, is combine your MOA with you cartridge's trajectory at varying distances, and given you make the correct adjustments, theoretically, you could shoot accurately at any distance, given wind is not a factor. Windage, is an entirely different thing.