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Rifles, Reloading, Optics, Equipment
Reloading
Neck tension variation
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<blockquote data-quote="Mikecr" data-source="post: 2295856" data-attributes="member: 1521"><p>It's important to understand WHAT is real.</p><p>Seating force is mostly frictional, and friction itself does not affect results.</p><p>With cases sized to the same length and interference:</p><p>I can coat a few inner necks with tungsten disulfide to greatly reduce seating force.</p><p>I can take a few inner necks to squeaky clean to greatly increase seating force.</p><p>Mix em up, shoot em across a chrono, into a group, -no difference.</p><p></p><p>A smaller portion of seating force is affected by tension.</p><p>There is currently no way to measure neck tension (hoop tension).</p><p>The best we can do is normalize friction, so that we can see variance in tension, and then adjust that.</p><p>This can be done with neck sizing LENGTH, and this does show on target.</p><p>I can directly raise or lower MV, with actual neck tension adjustments, independent of overall neck friction/seating forces.</p><p>But of course you can't adjust tension with bullets already seated.</p><p></p><p>I used to have a K&M arbor press with force measure, but built an electronic version with a better approach around 20yrs ago.</p><p>I use a load cell inside a mandrel die so that I can take measure in a pre-seating operation. I adjust tension and repeat measure until matching the batch. When it gets to be a battle, it's time to process anneal (I dip anneal) the whole batch.</p><p>It's after this that I seat bullets and ensure correct CBTO with each.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2295856, member: 1521"] It's important to understand WHAT is real. Seating force is mostly frictional, and friction itself does not affect results. With cases sized to the same length and interference: I can coat a few inner necks with tungsten disulfide to greatly reduce seating force. I can take a few inner necks to squeaky clean to greatly increase seating force. Mix em up, shoot em across a chrono, into a group, -no difference. A smaller portion of seating force is affected by tension. There is currently no way to measure neck tension (hoop tension). The best we can do is normalize friction, so that we can see variance in tension, and then adjust that. This can be done with neck sizing LENGTH, and this does show on target. I can directly raise or lower MV, with actual neck tension adjustments, independent of overall neck friction/seating forces. But of course you can't adjust tension with bullets already seated. I used to have a K&M arbor press with force measure, but built an electronic version with a better approach around 20yrs ago. I use a load cell inside a mandrel die so that I can take measure in a pre-seating operation. I adjust tension and repeat measure until matching the batch. When it gets to be a battle, it's time to process anneal (I dip anneal) the whole batch. It's after this that I seat bullets and ensure correct CBTO with each. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Neck tension variation
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