Understanding Rifle Precision
By David Bookstaber
When testing guns for accuracy it is common practice to look at the Extreme Spread of a group of 3 or 5 test shots. I will explain why this is a statistically bad measure on a statistically weak sample. Then I will explain why serious shooters and statisticians look instead at some variation of circular error probable (CEP) when assessing precision . . .
It is easy to fool yourself with Extreme Spread…and even easier to fool others. First, note that even the most precise rail gun will occasionally print a “flier.” If 99 out of …read more
Via:: Truth About Guns
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