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The Range
Ammo & Reloading
Neck Sizing Questions for Bolt Action Rifles
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<blockquote data-quote="MoBoost" data-source="post: 2150430" data-attributes="member: 3455"><p>Full length sizing - you need to make sure that the press cams over.</p><p></p><p>For accuracy you want consistency, with bushing neck sizing you are trying to achieve ultimate neck tension consistency.</p><p></p><p>Neck tension is determined by how hard the brass is, how much interference with the bullet there is, and how long is the bearing surface.</p><p></p><p>Hardness of the brass is addressed with annealing.</p><p></p><p>The length of the bearing surface is kept consistent with trimming and seating depth.</p><p></p><p>Neck interference is kept constant with an expander ball in most dies - the neck gets over-squeezed and then expanded - leaving fairly consistent interference fit with the bullet.</p><p></p><p>Since there is no expander ball in bushing die - the neck just gets squeezed to the right size. Since the bullet diameter and bushing size are constant - the neck thickness has to be constant, and that's why you have to turn necks to take advantage of the bushing die.</p></blockquote><p></p>
[QUOTE="MoBoost, post: 2150430, member: 3455"] Full length sizing - you need to make sure that the press cams over. For accuracy you want consistency, with bushing neck sizing you are trying to achieve ultimate neck tension consistency. Neck tension is determined by how hard the brass is, how much interference with the bullet there is, and how long is the bearing surface. Hardness of the brass is addressed with annealing. The length of the bearing surface is kept consistent with trimming and seating depth. Neck interference is kept constant with an expander ball in most dies - the neck gets over-squeezed and then expanded - leaving fairly consistent interference fit with the bullet. Since there is no expander ball in bushing die - the neck just gets squeezed to the right size. Since the bullet diameter and bushing size are constant - the neck thickness has to be constant, and that's why you have to turn necks to take advantage of the bushing die. [/QUOTE]
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Neck Sizing Questions for Bolt Action Rifles
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