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Rifles, Reloading, Optics, Equipment
Reloading
Neck Tension vs Bullet Seating & Release Pressure - Lessons Learned
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<blockquote data-quote="Mikecr" data-source="post: 2761602" data-attributes="member: 1521"><p>That's a lot of good work there, but also, there is a flaw in your foundation.</p><p>Bullets are not pushed out of necks (with pull force), but are released from neck grip (by expansion).</p><p>So a load could care less about seating force (friction), if tension is still managed to load development.</p><p>This muddles up some of your result notions.</p><p>On the other hand, you are observing spring back. You can see where excess just hits a wall.</p><p></p><p>If you really want to adjust tension, you need to vary sizing LENGTH.</p><p>This because tension (neck grip) is in PSI. So adjusting area of the spring back grip (force applied) adjusts tension.</p><p></p><p>Even with well normalized neck friction, tension does not directly correlate with friction (or seating force to overcome it).</p><p>And we currently have NO WAY to measure the hoop tension that is neck tension.</p><p>In summary, neck tension is neither interference fit, nor friction.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2761602, member: 1521"] That's a lot of good work there, but also, there is a flaw in your foundation. Bullets are not pushed out of necks (with pull force), but are released from neck grip (by expansion). So a load could care less about seating force (friction), if tension is still managed to load development. This muddles up some of your result notions. On the other hand, you are observing spring back. You can see where excess just hits a wall. If you really want to adjust tension, you need to vary sizing LENGTH. This because tension (neck grip) is in PSI. So adjusting area of the spring back grip (force applied) adjusts tension. Even with well normalized neck friction, tension does not directly correlate with friction (or seating force to overcome it). And we currently have NO WAY to measure the hoop tension that is neck tension. In summary, neck tension is neither interference fit, nor friction. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck Tension vs Bullet Seating & Release Pressure - Lessons Learned
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