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Rifles, Reloading, Optics, Equipment
Reloading
Can SD and ES be a shortcut for accuracy
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<blockquote data-quote="trebark" data-source="post: 414629" data-attributes="member: 19172"><p>SD = standard deviation</p><p>ES = extreme spread</p><p> </p><p>You find this by shooting threw a chronograph. For instance, you might load five rounds with a given powder load. You then shoot each round through a chronograph and record the velocities of each. </p><p> </p><p>Let's say you get the following velocities of 2890, 2895, 2900, 2905, 2910. This would give you an ES of 20 (2910-2890 = 20) and SD = 7.9 (can't tell you how to calculate SD, I just use Excel)</p><p> </p><p>Do you understand why it is important to have a low SD and ES?</p></blockquote><p></p>
[QUOTE="trebark, post: 414629, member: 19172"] SD = standard deviation ES = extreme spread You find this by shooting threw a chronograph. For instance, you might load five rounds with a given powder load. You then shoot each round through a chronograph and record the velocities of each. Let's say you get the following velocities of 2890, 2895, 2900, 2905, 2910. This would give you an ES of 20 (2910-2890 = 20) and SD = 7.9 (can't tell you how to calculate SD, I just use Excel) Do you understand why it is important to have a low SD and ES? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Can SD and ES be a shortcut for accuracy
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