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Depending on the statistical power desired, a sample size of 7 or 8 is generally considered a good starting point for determining whether or not samples (a shot, or shot group in this case) are an accurate representation of the true mean. This is why 5 shot groups are a weak indicator of a barrels precision (it's true mean/population mean).
Great points Molon!
Last edited by foxtrotx1; 02-02-16 at 23:21.
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