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Rifles, Reloading, Optics, Equipment
Reloading
Neck tension
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<blockquote data-quote="Mikecr" data-source="post: 2217687" data-attributes="member: 1521"><p>Neck tension does make a difference, but interference fit is not a direct way to measure it, nor a certain way to obtain it..</p><p>Let's say you set your neck interference to 10thou under cal for no more area than seated bullet bearing.</p><p>Does that 10thou increase neck tension over 2thou interference?</p><p>Answer: NO</p><p>Your seated bullet will simply up-size the neck to counter.</p><p>If you then pull that bullet you'll see your necks spring back to only around 1thou (max) interference. Even more likely ~1/2thou.</p><p>That's what you get with that effort, plus all the detriments caused by excessive sizing.</p><p></p><p>Actual tension, being pressure per area, can be controlled through area/length sized.</p><p>While seating .300" of bearing in necks, you could adjust sizing length (interference length) from .300" to .200" or .125" for examples to adjust tension. The interference amount which you would be adjusting the length of, need be no more than ~1thou, which the bullet will reset it to anyway.</p><p></p><p>This affects seating force as well. But it's not a direct measure of tension, and it's comparative value is hard tied to friction.</p><p>The friction has to be well normalized.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2217687, member: 1521"] Neck tension does make a difference, but interference fit is not a direct way to measure it, nor a certain way to obtain it.. Let's say you set your neck interference to 10thou under cal for no more area than seated bullet bearing. Does that 10thou increase neck tension over 2thou interference? Answer: NO Your seated bullet will simply up-size the neck to counter. If you then pull that bullet you'll see your necks spring back to only around 1thou (max) interference. Even more likely ~1/2thou. That's what you get with that effort, plus all the detriments caused by excessive sizing. Actual tension, being pressure per area, can be controlled through area/length sized. While seating .300" of bearing in necks, you could adjust sizing length (interference length) from .300" to .200" or .125" for examples to adjust tension. The interference amount which you would be adjusting the length of, need be no more than ~1thou, which the bullet will reset it to anyway. This affects seating force as well. But it's not a direct measure of tension, and it's comparative value is hard tied to friction. The friction has to be well normalized. [/QUOTE]
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Neck tension
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