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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="Mikecr" data-source="post: 1938944" data-attributes="member: 1521"><p>There are a lot of things you can see with seating force measure & it can be pretty useful.</p><p>An important thing to remember though is that <u>seating force/friction</u> DOES NOT directly represent <u>neck tension</u> (springback grip of bullet). </p><p>Also that you need to establish tension in stable form during load development, and manage that exactly.</p><p>Where you've well normalized seating friction(high or low), then seating force is more directly indicative of tension (in a comparative sense).</p><p></p><p>I can point out an issue with their automated seating device: it changes speed with force.</p><p>There is static and dynamic friction. To get good measure you have to seat close as possible to the same RATE, as a faster seating rate will read higher than a slower rate.</p><p>There must be some force absorption to their device. Possibly the clutch.. And that is slowing the seating rate at higher seating forces, which is bad for comparative measure.</p><p></p><p>Also, a better approach to comparing of seating forces is to do so in a way that allows adjustment and remeasure until matching. Instead of reading bullet seating force, it's better to measure a 'pre-seating' force with an instrumented mandrel. Then seat bullets when all necks match.</p><p>How do you match tension?</p><p>With neck sizing LENGTH (not interference).</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1938944, member: 1521"] There are a lot of things you can see with seating force measure & it can be pretty useful. An important thing to remember though is that [U]seating force/friction[/U] DOES NOT directly represent [U]neck tension[/U] (springback grip of bullet). Also that you need to establish tension in stable form during load development, and manage that exactly. Where you've well normalized seating friction(high or low), then seating force is more directly indicative of tension (in a comparative sense). I can point out an issue with their automated seating device: it changes speed with force. There is static and dynamic friction. To get good measure you have to seat close as possible to the same RATE, as a faster seating rate will read higher than a slower rate. There must be some force absorption to their device. Possibly the clutch.. And that is slowing the seating rate at higher seating forces, which is bad for comparative measure. Also, a better approach to comparing of seating forces is to do so in a way that allows adjustment and remeasure until matching. Instead of reading bullet seating force, it's better to measure a 'pre-seating' force with an instrumented mandrel. Then seat bullets when all necks match. How do you match tension? With neck sizing LENGTH (not interference). [/QUOTE]
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