ES isn't that useful. It only shows your best and worst shot. SD is better for prediction as it shows how your velocity is spread. The down side is you will need more shots to get a valid SD.
For example you could have 10 shots with 5 at 2710 and another 5 at 2750. Or 1 shot at 2710, 8 at 2730, and one at 2750. Both have the same ES and average, but one is signifficantly better. These cases aren't likely to occur because velocity is normally distributed, but it illustrates the difference.
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