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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy or low ES?
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<blockquote data-quote="dsculley" data-source="post: 1041859" data-attributes="member: 77514"><p>The link provided by coyotezapper is a good one. It is a modified version of Dan Newberry's OCW method. You may want to check out Dan's site as well ( <a href="http://optimalchargeweight.embarqspace.com/#" target="_blank">OCW Overview - Dan Newberry's OCW Load Development System</a> ). He also has a forum here - <a href="http://practicalrifler.fr.yuku.com/" target="_blank">Practical Riflery Forums... techniques and equipment of the practical rifleman... Forums</a> if you are interested in learning more about his method. </p><p></p><p>While ES is easy to use, Standard Deviation is a much better predictor of performance. Of course, for SD to be meaningful, you really need more than 3 - 5 shots. 10 is a good starting point. A change in neck tension in one round, or a change in case volume in one round can give you a large ES, but the SD for the load may still be small. While we try to be as consistent as possible, we sometimes don't measure everything or we overlook a minor detail that shows up on the chrony and target. If we do this during load development it can lead to erroneous conclusions. I know that I have made my share of mistakes in this area.</p><p></p><p>Just my 2 cents.</p><p></p><p>Dennis</p></blockquote><p></p>
[QUOTE="dsculley, post: 1041859, member: 77514"] The link provided by coyotezapper is a good one. It is a modified version of Dan Newberry's OCW method. You may want to check out Dan's site as well ( [url=http://optimalchargeweight.embarqspace.com/#]OCW Overview - Dan Newberry's OCW Load Development System[/url] ). He also has a forum here - [url=http://practicalrifler.fr.yuku.com/]Practical Riflery Forums... techniques and equipment of the practical rifleman... Forums[/url] if you are interested in learning more about his method. While ES is easy to use, Standard Deviation is a much better predictor of performance. Of course, for SD to be meaningful, you really need more than 3 - 5 shots. 10 is a good starting point. A change in neck tension in one round, or a change in case volume in one round can give you a large ES, but the SD for the load may still be small. While we try to be as consistent as possible, we sometimes don't measure everything or we overlook a minor detail that shows up on the chrony and target. If we do this during load development it can lead to erroneous conclusions. I know that I have made my share of mistakes in this area. Just my 2 cents. Dennis [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy or low ES?
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