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Rifles, Reloading, Optics, Equipment
Reloading
Neck size/ fl die or neck size die
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<blockquote data-quote="Mikecr" data-source="post: 1229152" data-attributes="member: 1521"><p>With anything but an underbore needing super high neck tension, I would avoid sizing the donut area ~1/16" up from neck-shoulder junction, no matter what.</p><p>I start at 1/8" sizing length from mouths, and adjust more in length during load development(tension adjustment) just in case it helps results. </p><p>I also stop before sizing beyond seated bullet bearing length.</p><p>And finally, I tweak sizing length slightly either direction to match pre-seating forces prior to bullet seating. This is an extra measure I can see with a load cell equipped Sinclair expander mandrel.</p><p>That's my normal sizing length window with a bushing normally 2thou under loaded neck diameter.</p><p></p><p>The longest bullet I seat is 140VLDs, which are pretty long and seated well away from donut area. My guns are all single shot bolt actions(no magazines). But even with longer bullets, magazine loaded & higher recoil, I would be surprised if more than 1/8"-1/4" of neck sizing length was needed. Any longer bullets will be larger than 26cal, providing more diameter area for neck springback to grip. However, if you anneal necks a lot, all bets are off. In this case, just be sure to load develop in the condition, and maintain whatever you end up with for sizing length.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1229152, member: 1521"] With anything but an underbore needing super high neck tension, I would avoid sizing the donut area ~1/16" up from neck-shoulder junction, no matter what. I start at 1/8" sizing length from mouths, and adjust more in length during load development(tension adjustment) just in case it helps results. I also stop before sizing beyond seated bullet bearing length. And finally, I tweak sizing length slightly either direction to match pre-seating forces prior to bullet seating. This is an extra measure I can see with a load cell equipped Sinclair expander mandrel. That's my normal sizing length window with a bushing normally 2thou under loaded neck diameter. The longest bullet I seat is 140VLDs, which are pretty long and seated well away from donut area. My guns are all single shot bolt actions(no magazines). But even with longer bullets, magazine loaded & higher recoil, I would be surprised if more than 1/8"-1/4" of neck sizing length was needed. Any longer bullets will be larger than 26cal, providing more diameter area for neck springback to grip. However, if you anneal necks a lot, all bets are off. In this case, just be sure to load develop in the condition, and maintain whatever you end up with for sizing length. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck size/ fl die or neck size die
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