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Rifles, Reloading, Optics, Equipment
Reloading
Do you sort by case weight? Loading To Scale
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<blockquote data-quote="QuietTexan" data-source="post: 2270835" data-attributes="member: 116181"><p>Correlation between case weight and volume does not mean you can determine causation of variance in velocity. You're assuming the weight is uniformly distributed through the walls of the case, and isn't located in the web or case head which make up a larger volumetric percentage of the case weight. Seating depth arguably has a larger impact on case volume than case weight variances, and is easier to measure and improve upon. There is also not a direct relationship between higher case volume and increased velocity because you can't discount the impact of interference fit of the bullet in the neck, bullet jump relative to throating, and several other variables impacting chamber pressure. </p><p></p><p>There are too many variables to show any causal link between weight, volume, and velocity, which is why when this comes up the people who take the time to gather real data consistently come down to the result of "no causation" even though their data tends to show correlation. There might be correlation, but to show that you have to take both weight and volume measurements on a particular group of cases to make the determination, at which point you've measured the actual capacity so why does weight even matter? Use the better measurement of volume since you have it.</p><p></p><p>[URL unfurl="true"]https://blog.ammolytics.com/2020-01-08/brass-sorting-part-one.html[/URL]</p><p>[URL unfurl="true"]https://www.defensivecarry.com/threads/reloading-case-weight-does-not-accurately-reflect-case-volume.455574/[/URL]</p><p>[URL unfurl="true"]https://www.ozfclass.com/phpbb/viewtopic.php?t=11906[/URL]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2270835, member: 116181"] Correlation between case weight and volume does not mean you can determine causation of variance in velocity. You're assuming the weight is uniformly distributed through the walls of the case, and isn't located in the web or case head which make up a larger volumetric percentage of the case weight. Seating depth arguably has a larger impact on case volume than case weight variances, and is easier to measure and improve upon. There is also not a direct relationship between higher case volume and increased velocity because you can't discount the impact of interference fit of the bullet in the neck, bullet jump relative to throating, and several other variables impacting chamber pressure. There are too many variables to show any causal link between weight, volume, and velocity, which is why when this comes up the people who take the time to gather real data consistently come down to the result of "no causation" even though their data tends to show correlation. There might be correlation, but to show that you have to take both weight and volume measurements on a particular group of cases to make the determination, at which point you've measured the actual capacity so why does weight even matter? Use the better measurement of volume since you have it. [URL unfurl="true"]https://blog.ammolytics.com/2020-01-08/brass-sorting-part-one.html[/URL] [URL unfurl="true"]https://www.defensivecarry.com/threads/reloading-case-weight-does-not-accurately-reflect-case-volume.455574/[/URL] [URL unfurl="true"]https://www.ozfclass.com/phpbb/viewtopic.php?t=11906[/URL] [/QUOTE]
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Do you sort by case weight? Loading To Scale
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