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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair mandrels
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<blockquote data-quote="Mikecr" data-source="post: 2372697" data-attributes="member: 1521"><p>There is importance to pre-expansion that should also be considered. </p><p>Downsizing adds energy to brass. The brass will then seek lowest energy balance by springing back counter last action. Most at once, but continuing over time. So if last action is downsizing the brass springs back outward, and will continue to relieve itself over time. So if bullet seating after collet sizing does not upsize necks, then tension will decrease over time. You would need to excessively downsize, so that seating bullets function the same as an expander mandrel to prevent tension loss over time.</p><p>Most people already do this, but bullets are not hardened expanders.Mandrels are.</p><p>This is a pre-seating operation.</p><p></p><p>Mandrels also cause less runout than die buttons. They reduce runout further by pushing thickness variance outward, away from seating bullets.</p><p>This may or may not function as effectively as collet compression - for runout. But it's a sound method for us bushing users, who benefit from bushings, beyond mere runout.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2372697, member: 1521"] There is importance to pre-expansion that should also be considered. Downsizing adds energy to brass. The brass will then seek lowest energy balance by springing back counter last action. Most at once, but continuing over time. So if last action is downsizing the brass springs back outward, and will continue to relieve itself over time. So if bullet seating after collet sizing does not upsize necks, then tension will decrease over time. You would need to excessively downsize, so that seating bullets function the same as an expander mandrel to prevent tension loss over time. Most people already do this, but bullets are not hardened expanders.Mandrels are. This is a pre-seating operation. Mandrels also cause less runout than die buttons. They reduce runout further by pushing thickness variance outward, away from seating bullets. This may or may not function as effectively as collet compression - for runout. But it's a sound method for us bushing users, who benefit from bushings, beyond mere runout. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair mandrels
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