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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What “Causes” a Low SD/ES?
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<blockquote data-quote="nksmfamjp" data-source="post: 2260143" data-attributes="member: 1951"><p>When you say you have it "down", I think:</p><p>What is the accuracy of your tools/process?</p><p>What is your process design?</p><p>How did you determine primer type, bullet, powder, neck tension, case fit, case brand, etc?</p><p>What are the measured results: predictive like runout or charge variation? Also, final results like group size, sd, mean radius?</p><p>Also when you post an sd/es…..how many rounds in the chrono group? By definition, when the sample accurately predicts the population, ES>= 6xSd for a normal distribution.</p><p></p><p><img src="https://img.over-blog-kiwi.com/3/61/05/92/20191201/ob_5d0980_20191201-103230-1.jpg#width=1080&height=688" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="nksmfamjp, post: 2260143, member: 1951"] When you say you have it “down”, I think: What is the accuracy of your tools/process? What is your process design? How did you determine primer type, bullet, powder, neck tension, case fit, case brand, etc? What are the measured results: predictive like runout or charge variation? Also, final results like group size, sd, mean radius? Also when you post an sd/es…..how many rounds in the chrono group? By definition, when the sample accurately predicts the population, ES>= 6xSd for a normal distribution. [IMG]https://img.over-blog-kiwi.com/3/61/05/92/20191201/ob_5d0980_20191201-103230-1.jpg#width=1080&height=688[/IMG] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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What “Causes” a Low SD/ES?
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