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Old November 17, 2017, 12:56 PM   #4
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Join Date: June 20, 2007
Location: Starkville, MS
Posts: 6,780
What Sharkbite said. A barrel oscillates as the bullet travels down it. If the muzzle is at the top of an oscillation cycle as the bullet exits on one shot and at the bottom of the cycle for the next shot then that results in group spread. That is one reason why standard deviation becomes such a big deal with accuracy.
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