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Things that make groups open up to more MOA's as range increases.......
Muzzle velocity spread.
Bullet's BC spread (caused by how much out of balance they are; they ain't all perfect).
Subtle air currents in all directions we cannot see; even with properly set spotting scopes.
Air density variables caused by different temperature bands the bullets go through.
And the group size at the muzzle is always zero MOA, isn't it?
Last edited by Bart B.; June 6, 2013 at 12:55 PM.
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