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Rifles, Reloading, Optics, Equipment
Reloading
Inside the case neck
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<blockquote data-quote="Mikecr" data-source="post: 260209" data-attributes="member: 1521"><p>How do you 'know' this?</p><p>Have you invented a tool that actually measures tension?</p><p>If so, I'm interested. My pressure trace offers an electronic measure similar to K&M's mechanical measure -for seating force(which is not really tension). </p><p></p><p>I don't clean inside necks anymore than the rest of the case(through vibratory cleaning), and I've achieved ES<10 as measured from an Oehler with 20' screen spacing. I get it with efficient powder burn and necks .0005 under cal(fitted necks).</p><p></p><p>I can't imagine neck friction affecting anything really as the neck expands to release the bullet before any movement occurs. But tension matters because of the affected pressure spike and barrel timing.</p><p>If you really want lower variance in tension you must go low with it. Less tension equals less variance in pressure needed to release the bullet.</p><p>Tension variance in necks ~.003 under cal, creates very high ES. </p><p>This is common, and often 'worked around' by stress relieving(misnomer annealing) the necks fairly often.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 260209, member: 1521"] How do you 'know' this? Have you invented a tool that actually measures tension? If so, I'm interested. My pressure trace offers an electronic measure similar to K&M's mechanical measure -for seating force(which is not really tension). I don't clean inside necks anymore than the rest of the case(through vibratory cleaning), and I've achieved ES<10 as measured from an Oehler with 20' screen spacing. I get it with efficient powder burn and necks .0005 under cal(fitted necks). I can't imagine neck friction affecting anything really as the neck expands to release the bullet before any movement occurs. But tension matters because of the affected pressure spike and barrel timing. If you really want lower variance in tension you must go low with it. Less tension equals less variance in pressure needed to release the bullet. Tension variance in necks ~.003 under cal, creates very high ES. This is common, and often 'worked around' by stress relieving(misnomer annealing) the necks fairly often. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Inside the case neck
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