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Rifles, Reloading, Optics, Equipment
Reloading
Neck tension
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<blockquote data-quote="Carey Farmer" data-source="post: 3064263" data-attributes="member: 122715"><p>Exactly. Neck tension is a function of how much cold-working you do after annealing.</p><p></p><p>Brass is pretty ductile, so it takes quite a bit - something like 30% - of deformation to develop full hardness. But brass also work-hardens remarkably well. Fully annealed cartridge brass has yield strength of about 20 ksi. Fully hardened (cold-worked) cartridge brass has a yield strength of about 60ksi.</p><p></p><p>Typical deformation involved with fired case sizing is down 0.010" then up 0.003" which is about 5% deformation total. Assuming you anneal before sizing, then if you size down .012" then up 0.005", that is 6% deformation total. So you will develop a little more yield strength (and therefore more neck tension) if you size down more.</p><p></p><p>But neck tension won't change if after sizing down, you size up with a mandrel only .0005" below bullet diameter vs. sizing up with a mandrel .002" below bullet diameter, and then using the bullet to size up the rest of the way up. The only thing that impacts neck tension is the total percent deformation after annealing.</p></blockquote><p></p>
[QUOTE="Carey Farmer, post: 3064263, member: 122715"] Exactly. Neck tension is a function of how much cold-working you do after annealing. Brass is pretty ductile, so it takes quite a bit - something like 30% - of deformation to develop full hardness. But brass also work-hardens remarkably well. Fully annealed cartridge brass has yield strength of about 20 ksi. Fully hardened (cold-worked) cartridge brass has a yield strength of about 60ksi. Typical deformation involved with fired case sizing is down 0.010" then up 0.003" which is about 5% deformation total. Assuming you anneal before sizing, then if you size down .012" then up 0.005", that is 6% deformation total. So you will develop a little more yield strength (and therefore more neck tension) if you size down more. But neck tension won't change if after sizing down, you size up with a mandrel only .0005" below bullet diameter vs. sizing up with a mandrel .002" below bullet diameter, and then using the bullet to size up the rest of the way up. The only thing that impacts neck tension is the total percent deformation after annealing. [/QUOTE]
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Neck tension
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