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Old August 8, 2012, 02:31 PM   #8
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 21,024
Small numbers. If you can get a medium power rifle SD down to 10 fps, you are doing very well. ES will depend more on the group size, as, even with an accurate SD, the more rounds you put on the target the greater the chance that one will be randomly farther out than usual. But for 10 shots with 95% confidence the expected value of ES will be about 3.1 times bigger than SD; for 5 shots, 2.3 times bigger, for 15 shots, 3.5 times bigger, for 3 shots 1.7 times bigger.
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