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Message: <blockquote data-quote="okietom" data-source="post: 2610357" data-attributes="member: 18710">ES means extreme spread, the difference between the highest velocity and the lowest velocity. SD is standard deviation, it is the measure of the range of the samples from the average of  them all.The smaller these numbers are, the more consistent the velocity is. That will make shot to shot accuracy better at a longer distance. It is using statistics and physics to load more accurate ammo. You know, using that high school math that most people think is stupid when they are in high school and then don't even know they are using it when they grow up.</blockquote>