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Rifles, Reloading, Optics, Equipment
Reloading
Mandrel as last step?
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<blockquote data-quote="Mikecr" data-source="post: 2720136" data-attributes="member: 1521"><p>Mandrel expansion should be seen as a pre-seating action.</p><p>It does push most thickness variance outward -away from seating bullets. With this, bullets seat straighter.</p><p>Pre-seating expansion itself is needed to bias residual springback energy inward, against bullet bearing.</p><p>Otherwise, if last sizing energy is inward, then brass will eventually reach lowest energy level by counter expanding outward, away from bullet bearing. This, reducing tension over time.</p><p></p><p>We should always size necks outward last, before seating bullets. And truly we should not be upsizing necks with bullet seating.</p><p>Bullets ARE NOT neck sizers.</p><p>Bullet seating should expand necks no more than normal elastic limit (springback range), which is not actual upsizing/yielding.</p><p>For tension adjustments, we should adjust sizing length on necks, and not interference.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2720136, member: 1521"] Mandrel expansion should be seen as a pre-seating action. It does push most thickness variance outward -away from seating bullets. With this, bullets seat straighter. Pre-seating expansion itself is needed to bias residual springback energy inward, against bullet bearing. Otherwise, if last sizing energy is inward, then brass will eventually reach lowest energy level by counter expanding outward, away from bullet bearing. This, reducing tension over time. We should always size necks outward last, before seating bullets. And truly we should not be upsizing necks with bullet seating. Bullets ARE NOT neck sizers. Bullet seating should expand necks no more than normal elastic limit (springback range), which is not actual upsizing/yielding. For tension adjustments, we should adjust sizing length on necks, and not interference. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Mandrel as last step?
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