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Rifles, Reloading, Optics, Equipment
Reloading
Neck sizing belted magnums
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<blockquote data-quote="Mikecr" data-source="post: 1318924" data-attributes="member: 1521"><p>I don't FL size cartridges,, but then I don't shoot large area cases with high body taper and low shoulder angles in factory chambers. If I did, I would FL size them, as it would not be long before it was required anyway. I plan otherwise. </p><p></p><p>Bushing or custom partial neck sizing works great(I'm sure best), but the necks should still be expanded, or 'pre-seated'. It is not excess to do so when you understand tension.</p><p>There is sound reasoning behind most die maker's recommended 2thou under loaded diameter for the bushing. This reasoning includes expected neck expansion to ~1thou after downsizing.</p><p>#1 Neck tension amounts to no more than spring back against seated bullet bearing, and max spring back is 1thou.</p><p>#2 Bullets should not be used as expanders.</p><p>#3 Expansion drives thickness variance outward, away from seating bullets.</p><p></p><p>I use Wilson neck dies, and couldn't recommend between the more expensive toys out there.</p><p>The Wilsons do not include an expander rod, and I would remove this if they did. Instead, I use Sinclair expander dies/mandrels in a separate operation.</p><p>My expander die is modified to include a load cell force measurement. With this, and careful control over friction(I leave the carbon layer alone), I establish matched pre-seating forces in necks before charging cases with powder.</p><p>This is not direct tension measure, which we have no way to do currently. But I'm confident that my necks are as consistent in tension as possible from my part.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1318924, member: 1521"] I don't FL size cartridges,, but then I don't shoot large area cases with high body taper and low shoulder angles in factory chambers. If I did, I would FL size them, as it would not be long before it was required anyway. I plan otherwise. Bushing or custom partial neck sizing works great(I'm sure best), but the necks should still be expanded, or 'pre-seated'. It is not excess to do so when you understand tension. There is sound reasoning behind most die maker's recommended 2thou under loaded diameter for the bushing. This reasoning includes expected neck expansion to ~1thou after downsizing. #1 Neck tension amounts to no more than spring back against seated bullet bearing, and max spring back is 1thou. #2 Bullets should not be used as expanders. #3 Expansion drives thickness variance outward, away from seating bullets. I use Wilson neck dies, and couldn't recommend between the more expensive toys out there. The Wilsons do not include an expander rod, and I would remove this if they did. Instead, I use Sinclair expander dies/mandrels in a separate operation. My expander die is modified to include a load cell force measurement. With this, and careful control over friction(I leave the carbon layer alone), I establish matched pre-seating forces in necks before charging cases with powder. This is not direct tension measure, which we have no way to do currently. But I'm confident that my necks are as consistent in tension as possible from my part. [/QUOTE]
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