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Rifles, Reloading, Optics, Equipment
Reloading
SIMPLE question on neck tension
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<blockquote data-quote="Mikecr" data-source="post: 1842962" data-attributes="member: 1521"><p>What we need from bushing neck sizing and follow-up expansion is no more than 1thou interference to cal (which can take a bit of trial & error to actually achieve), and desired neck sizing length (area to grip). With a given bushing you can adjust neck tension by adjusting length of neck sizing.</p><p>Bushing dies make this easy, and if you go no more than needed here, your neck induced runout can be kept very low, and work hardening can be reduced to minimum.</p><p></p><p>On <em>uncontrolled</em> tension:</p><p>Consider a neck FL sized with bullet bearing seated ¾ that length.</p><p>The interference is expanded only by that seated length, with the rest unexpanded and representing a lot of stored energy.</p><p>Now the energy contains not just that of partial length sized & well above donut area, but everything available, and it's <u>binding</u> (angular) on the bullet's base-bearing junction.</p><p>'Everything available' here is partial neck length + donut brass + expansion resistance of shoulder. That's significantly more variables and it's force is way beyond partial length sizing against only bullet bearing. That's why I coin it as uncontrolled.</p><p></p><p>There are underbore cartridges that love extreme starting pressures. So much so that they reward well beyond the negatives in high neck tension variance.</p><p>These are not hunting capacity cartridges though. They are things like 6PPC, 30BR, 30wolfpup (neckless).</p><p>[ATTACH=full]178630[/ATTACH]</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1842962, member: 1521"] What we need from bushing neck sizing and follow-up expansion is no more than 1thou interference to cal (which can take a bit of trial & error to actually achieve), and desired neck sizing length (area to grip). With a given bushing you can adjust neck tension by adjusting length of neck sizing. Bushing dies make this easy, and if you go no more than needed here, your neck induced runout can be kept very low, and work hardening can be reduced to minimum. On [I]uncontrolled[/I] tension: Consider a neck FL sized with bullet bearing seated ¾ that length. The interference is expanded only by that seated length, with the rest unexpanded and representing a lot of stored energy. Now the energy contains not just that of partial length sized & well above donut area, but everything available, and it’s [U]binding[/U] (angular) on the bullet’s base-bearing junction. ‘Everything available’ here is partial neck length + donut brass + expansion resistance of shoulder. That’s significantly more variables and it’s force is way beyond partial length sizing against only bullet bearing. That’s why I coin it as uncontrolled. There are underbore cartridges that love extreme starting pressures. So much so that they reward well beyond the negatives in high neck tension variance. These are not hunting capacity cartridges though. They are things like 6PPC, 30BR, 30wolfpup (neckless). [ATTACH type="full"]178630[/ATTACH] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
SIMPLE question on neck tension
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