Here's a pretty good website that I've read through a couple of times about Mil dots and MOA.
http://www.mil-dot.com/Mil_Dot_Information.htm
For practical purposes 1 MOA at 100 yards is the same as 1" at 100 yards.
But 1 MOA at 200 yards would be about a 2" group at 200 yards. You can see that MOA is more of an "angular" measurement.
For example, someone may say, "my gun shoots 1 MOA at 1,000 yards/meters". Well, that's a 10" group at that range but it's still 1 MOA because 1 "minute of angle" would cover about 10" inches at that range.
I measure my groups from outside to outside, and then subtract the caliber of the gun I'm shooting.
For example, I just shot a 3 shot group a couple of weeks ago that measured... .707" Subtracting .308 from that measurement gives me the "actual group size" at .399"
http://www.mil-dot.com/Mil_Dot_Information.htm
For practical purposes 1 MOA at 100 yards is the same as 1" at 100 yards.
But 1 MOA at 200 yards would be about a 2" group at 200 yards. You can see that MOA is more of an "angular" measurement.
For example, someone may say, "my gun shoots 1 MOA at 1,000 yards/meters". Well, that's a 10" group at that range but it's still 1 MOA because 1 "minute of angle" would cover about 10" inches at that range.
I measure my groups from outside to outside, and then subtract the caliber of the gun I'm shooting.
For example, I just shot a 3 shot group a couple of weeks ago that measured... .707" Subtracting .308 from that measurement gives me the "actual group size" at .399"
