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Rifles, Reloading, Optics, Equipment
Reloading
Audette / Ladder Test / OCW Explanation
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<blockquote data-quote="groper" data-source="post: 445883" data-attributes="member: 12550"><p>ES = extreme spread</p><p>SD = standard deviation</p><p></p><p>they are the measures of the differences in velocity, shot to shot, for the load your testing/using.</p><p></p><p>extreme spread is the maximum and mimimum velocities of that load, or more precisely, the difference between them measured in fps.</p><p></p><p>Standard deviation, is more complicated, its worked out from the average velocity of 5 shots of a particular load, and the standard deviation your most likely to get above or below this average velocity. I never use SD and dont really see the value of it... i simply look at ES because its easier to understand and correlates to a long range ladder test in that your lowest impact has the lowest velocity and highest impact the highest, so you can see the end result of the load physically on the target and you will know within what vertical range your shots might fall, at distance, in a hunting situation.</p></blockquote><p></p>
[QUOTE="groper, post: 445883, member: 12550"] ES = extreme spread SD = standard deviation they are the measures of the differences in velocity, shot to shot, for the load your testing/using. extreme spread is the maximum and mimimum velocities of that load, or more precisely, the difference between them measured in fps. Standard deviation, is more complicated, its worked out from the average velocity of 5 shots of a particular load, and the standard deviation your most likely to get above or below this average velocity. I never use SD and dont really see the value of it... i simply look at ES because its easier to understand and correlates to a long range ladder test in that your lowest impact has the lowest velocity and highest impact the highest, so you can see the end result of the load physically on the target and you will know within what vertical range your shots might fall, at distance, in a hunting situation. [/QUOTE]
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Audette / Ladder Test / OCW Explanation
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