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Rifles, Reloading, Optics, Equipment
Reloading
Neck tension and max bullet grip force
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<blockquote data-quote="Mikecr" data-source="post: 2169898" data-attributes="member: 1521"><p>If you're getting good results with FL sizing of necks, then there is reason to consider as good or better results with partial length bushing sizing and the right powder. The LENGTH of interference can be adjusted with a bushing die to tweak tension while avoiding sizing/bringing donut into tension.</p><p>With this, tension variance will be greatly reduced.</p><p>There is no reason to overwork necks with this. Just size down enough to get a good mandrel pre-seating, for a length of that sizing that never exceeds seated bullet bearing.</p><p>Bullet grip will be spring back force X area of bearing gripped. PSI</p><p></p><p>Sizing length beyond seated bearing leads to a binding tension on the bearing-base junction. That's a lot more tension, and tension variance, do to bringing so much more into tension that is not as well controlled. Donut area, and shoulders.</p><p>If you're finding better results during development with an extreme sizing here -then you need to move to a faster powder that still fills the case at SAAMI max pressures. Get back to rational and lasting reloading.</p><p></p><p>If missing info to do so, dump the manuals(all of them) and get QuickLoad.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2169898, member: 1521"] If you're getting good results with FL sizing of necks, then there is reason to consider as good or better results with partial length bushing sizing and the right powder. The LENGTH of interference can be adjusted with a bushing die to tweak tension while avoiding sizing/bringing donut into tension. With this, tension variance will be greatly reduced. There is no reason to overwork necks with this. Just size down enough to get a good mandrel pre-seating, for a length of that sizing that never exceeds seated bullet bearing. Bullet grip will be spring back force X area of bearing gripped. PSI Sizing length beyond seated bearing leads to a binding tension on the bearing-base junction. That's a lot more tension, and tension variance, do to bringing so much more into tension that is not as well controlled. Donut area, and shoulders. If you're finding better results during development with an extreme sizing here -then you need to move to a faster powder that still fills the case at SAAMI max pressures. Get back to rational and lasting reloading. If missing info to do so, dump the manuals(all of them) and get QuickLoad. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Neck tension and max bullet grip force
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