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Rifles, Reloading, Optics, Equipment
Reloading
Setting neck tension with expander mandrel and bushing die questions
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<blockquote data-quote="Mikecr" data-source="post: 1882377" data-attributes="member: 1521"><p>Neck turning serves to reduce runout and reduce neck tension. This, lowering variance of neck tension.</p><p>But it doesn't change the root benefit of pre-seating expansion, which is to bias neck energy (springback) inward rather than outward</p><p></p><p>While necks are trying to spring back inward, but cannot because of a seated bullet, the bullet gripping force holds as constant. Basically, at max available from the brass.</p><p>While necks are trying to spring back outward, which they are free to do, the gripping force reduces over time. </p><p>Here, spring back variances are normalized to cause higher tension variance.</p><p></p><p>There is no scenario where proper neck downsizing followed by proper neck expansion is detrimental.</p><p>As with many other areas, the <em><u>proper</u></em> part of this is allusive to most..</p><p>They migrated from basics to what they think is more advanced without ever actually learning the basics.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1882377, member: 1521"] Neck turning serves to reduce runout and reduce neck tension. This, lowering variance of neck tension. But it doesn't change the root benefit of pre-seating expansion, which is to bias neck energy (springback) inward rather than outward While necks are trying to spring back inward, but cannot because of a seated bullet, the bullet gripping force holds as constant. Basically, at max available from the brass. While necks are trying to spring back outward, which they are free to do, the gripping force reduces over time. Here, spring back variances are normalized to cause higher tension variance. There is no scenario where proper neck downsizing followed by proper neck expansion is detrimental. As with many other areas, the [I][U]proper[/U][/I] part of this is allusive to most.. They migrated from basics to what they think is more advanced without ever actually learning the basics. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Setting neck tension with expander mandrel and bushing die questions
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