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Rifles, Reloading, Optics, Equipment
Reloading
Help getting set up to use mandrels
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<blockquote data-quote="Mikecr" data-source="post: 1980502" data-attributes="member: 1521"><p>The best neck expansion is really a Pre-Seating operation.</p><p>That is, using an expander mandrel for neck up-sizing instead of bullets (which are not made for this).</p><p>While most people do up-size necks with seating of bullets, it's not ideal.</p><p></p><p>What grips bullets is no more than neck spring back force against an area of seated bullet bearing. Spring back is ~1/2thou. And when you seat a bullet in a neck, regardless of the interference size and force to do so, then pull that bullet, the neck will spring back that ~1/2thou from cal.</p><p>So to size minimally, while keeping full tension, you would run an expander mandrel through necks at the same diameter as your bullets (at cal). You can get .308 mandrels from 21st: <a href="http://www.xxicsi.com/caliber-specific-expander-mandrels.html" target="_blank">http://www.xxicsi.com/caliber-specific-expander-mandrels.html</a></p><p>After expansion, the necks will spring back ~1/2thou, ready for actual bullet seating.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1980502, member: 1521"] The best neck expansion is really a Pre-Seating operation. That is, using an expander mandrel for neck up-sizing instead of bullets (which are not made for this). While most people do up-size necks with seating of bullets, it's not ideal. What grips bullets is no more than neck spring back force against an area of seated bullet bearing. Spring back is ~1/2thou. And when you seat a bullet in a neck, regardless of the interference size and force to do so, then pull that bullet, the neck will spring back that ~1/2thou from cal. So to size minimally, while keeping full tension, you would run an expander mandrel through necks at the same diameter as your bullets (at cal). You can get .308 mandrels from 21st: [URL]http://www.xxicsi.com/caliber-specific-expander-mandrels.html[/URL] After expansion, the necks will spring back ~1/2thou, ready for actual bullet seating. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Help getting set up to use mandrels
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