Newbie question: definition of MOA?

kevral

Member
Joined
Feb 6, 2002
Messages
22
Location
Oslo, Norway
Hope someone can clear this up a bit for me:

I think I read somewhere that its Minute Of Angle? And that it means 1" at 100 yds?

How do you measure groups? Center of bullet hole to center of bullet hole or outer edge - outer edge?

I'm not entirely sure about my math either. Think I remember something about likesided triagles: would 1"@ 100 yds correspond to 5"@ 500yds?

Feedback greatly appreciated!

Kev
 

Steve Shelp

Well-Known Member
Joined
May 3, 2001
Messages
351
Location
NC
I think I read somewhere that its Minute Of Angle?
that is correct

And that it means 1" at 100 yds?
for all intents and purposes yes. to be exact it equals 1.047" at 100yds. So you can see why everyone jsut rounds down that 47 thousands of an inch to make it 1" for easy calculations.

How do you measure groups? Center of bullet hole to center of bullet hole or outer edge - outer edge?
measure the 2 furthest bullets holes from outside edge to outside then subtract the bullet diameter to give you the c-to-c measurement which is the standard for measuring groups.
Keep in mind that a hole in target paper isn't exactly the true bullet diameter either. It actually measures smaller. So depending on how detailed you what your group measurement keep this in mind. If your curious of how small, just measure the diameter of a know caliber size bullet hole in your target paper under a magnifying glass. But honestly I jsut subtract bullet diameter for my own reference to keep it simple.

would 1"@ 100 yds correspond to 5"@ 500yds?
you haven't forgotten everything obviosuly. your right on the money. Or to be exact as mentioned above the true MOA at 500yd would be 1.047x5 or 5.235". So how important is that .235" to you at 500yds?

Hope this helps,
Steve
 

Trending threads

Nightforce has great tracking capabilities, they are rugged, a bunch of elevation, holds zero forever, and reticles are designed for long range shooting. So if you are looking to shoot long distances constantly, then you need a scope that can take the abuse. -- gilmillan1


Culture Of Excellence At Nightforce Optics
By Len Backus

A high level of quality both in production and in service. Read More


Nightforce is such a solid combo of reticle, available elevation, glass that is good enough to shoot at the longest range you can dial. Nightforce has bullet proof construction that can handle the incidental horse rolling or some other rodeo action. -- bigngreen


Nightforce ATACR Scope Review
By Jeff Brozovich

The new NightForce ATACR is for sure a top choice for any long range shooter. Read More


The total package. Nightforce is the best I have used as far as turret feel and solid detents. I have never had one that didn't track right on and always return to zero. Nightforce NXS is the best value for everything I need. -- Broz


Nightforce Velocity 1000 Reticle Review
By Scott Shreve

I think Nightforce knocked it outta the park with this reticle! Read More

NightForce


Top