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Rifles, Reloading, Optics, Equipment
Reloading
? on ES / SD
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<blockquote data-quote="goodgrouper" data-source="post: 209587" data-attributes="member: 2852"><p>On a 3 shot group, the standard deviation will always be half of the extreme spread.</p><p></p><p>And I disagree with the other posters. If used in a load development ladder of .5 grain increments, a three shot group method will tell you what to re-test by showing you the nodes. If the SD stays good again on a different day, you have a winner for that temperature range 95% of the time.</p><p></p><p>In other words, a 5 shot group on one day is less meaningful than two 3 shot groups on two different days.</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 209587, member: 2852"] On a 3 shot group, the standard deviation will always be half of the extreme spread. And I disagree with the other posters. If used in a load development ladder of .5 grain increments, a three shot group method will tell you what to re-test by showing you the nodes. If the SD stays good again on a different day, you have a winner for that temperature range 95% of the time. In other words, a 5 shot group on one day is less meaningful than two 3 shot groups on two different days. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
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