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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy=seating depth or tenths of powder
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<blockquote data-quote="Pdvdh" data-source="post: 1130397" data-attributes="member: 4191"><p>Your chart shows you tested very small changes in bullet seating depth, and you're measuring MVs with an instrument that has limits of precision. You've also tested MV with bullets seated very close to touching the lands - the tests you ran at 0.000" might as well be removed from your graph, since the slightest error in measurement or bullet construction will mean bullets touching versus not touching the lands. This is a bullet seating testing depth which needlessly adds error for the purpose of definitively and conclusively correcting me. No small variance in seating depth will change MV more so than a small change placing the bullets into contact with the lands versus a small change removing contact with the lands. You're testing changes in seating depth that could be statistically meaningless, because you don't have the instrumentation to accurately control the seating depths and record the results. In other words, you could run your same tests again and the background noise associated with your seating depth changes and MV measurements could produce a different authoritative "chart". Changes in powder charges, primer intensity, neck tension, internal case capacity, and the temperature of the cartridges and barrel/chamber are examples of additional factors that will add to the background noise limiting one's ability to draw meaningful conclusions - conclusions based on meaningful changes/trends in MV. </p><p></p><p>Lastly, you never stated your position on the question as to whether MV increases or decreases with bullet seating depth. Leaves one with the impression you were so focused on refuting my correct position, that you never shared anything useful, other than small changes in bullet seating depth of +/-0.005" may or may not result in a change in MV that can - statistically, reliably, repeatedly, and meaningfully - be detected and reported. </p><p></p><p>Which begs the question; do you have a position to share as to whether substantial changes in bullet seating depth - seating the bullet deeper into the casing (farther away from the lands) - increases or decreases MV? Answer that question in a meaningful way, and you'll have contributed something useful. Qualify your answer in a manner that restricts the changes in seating depths to minutia such that we lack the tools and instruments to measure reliable trends in MV - higher or lower - and you'll have accomplished only one thing. Nit picking.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1130397, member: 4191"] Your chart shows you tested very small changes in bullet seating depth, and you're measuring MVs with an instrument that has limits of precision. You've also tested MV with bullets seated very close to touching the lands - the tests you ran at 0.000" might as well be removed from your graph, since the slightest error in measurement or bullet construction will mean bullets touching versus not touching the lands. This is a bullet seating testing depth which needlessly adds error for the purpose of definitively and conclusively correcting me. No small variance in seating depth will change MV more so than a small change placing the bullets into contact with the lands versus a small change removing contact with the lands. You're testing changes in seating depth that could be statistically meaningless, because you don't have the instrumentation to accurately control the seating depths and record the results. In other words, you could run your same tests again and the background noise associated with your seating depth changes and MV measurements could produce a different authoritative "chart". Changes in powder charges, primer intensity, neck tension, internal case capacity, and the temperature of the cartridges and barrel/chamber are examples of additional factors that will add to the background noise limiting one's ability to draw meaningful conclusions - conclusions based on meaningful changes/trends in MV. Lastly, you never stated your position on the question as to whether MV increases or decreases with bullet seating depth. Leaves one with the impression you were so focused on refuting my correct position, that you never shared anything useful, other than small changes in bullet seating depth of +/-0.005" may or may not result in a change in MV that can - statistically, reliably, repeatedly, and meaningfully - be detected and reported. Which begs the question; do you have a position to share as to whether substantial changes in bullet seating depth - seating the bullet deeper into the casing (farther away from the lands) - increases or decreases MV? Answer that question in a meaningful way, and you'll have contributed something useful. Qualify your answer in a manner that restricts the changes in seating depths to minutia such that we lack the tools and instruments to measure reliable trends in MV - higher or lower - and you'll have accomplished only one thing. Nit picking. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Accuracy=seating depth or tenths of powder
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