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Old March 27, 2007, 11:52 PM   #7
Johnny Guest
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Join Date: August 28, 1999
Location: North Texas
Posts: 4,123
Specifications: RADIUS vs. DIAMETER

rwilson452 - -

I think I can see the source of the confusion there. Please read again: The ball ammo - -
Quote:
2.00" mean radius avg. at 200 yards. This means about 2 minutes of angle.
and the tracer ammo --
Quote:
an accuracy standard of 5.0" mean radius max. avg. at 200 yards, or about 5 MOA.
Emphasis added. Please note: Radius is one-half of the diameter of a circle. Therefore, 2" radius at 200 yards would equal a 4" diameter circle, or, presumably, 2" at 100. And, I agree, we can round off one MOA to 1" at 100 yards.

Same with the tracer ammo - - 5" radius at 200 yards is about 5" diameter at 100.

Why the military specifications are so written, I don't know. Perhaps it simply indicates that, at the specified 200 yard range, no single bullet strike is apt to be more than 2" from the point of aim. This is really what counts, I suppose. It is certainly why I'm not bothered hunting larger game with a rifle that will "only" shoot a 2" group at 100 yards.

Regards,
Johnny
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