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Rifles, Reloading, Optics, Equipment
Reloading
How to Identify a Neck Donut?
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<blockquote data-quote="Mikecr" data-source="post: 1908365" data-attributes="member: 1521"><p>Body sizing rolls brass up the case. Neck bushings contribute nothing to donut formation.</p><p>Yes, and also when seating bullet bearing into donut area (but bad plan there).</p><p></p><p>By process of manufacture, cases are thickest near webs, tapering to thinnest by case mouths. So it is normal for necks to be thicker near neck-shoulder junction than at mouths. In other words, a donut is built in initially.</p><p>From there, it is our sizing that contributes to problem donut thickness.</p><p>Upsizing necks causes thicker shoulder brass to become neck area (donut formation).</p><p>Heavy sizing of case bodies rolls brass thick toward thin (up the case).</p><p></p><p>Donuts being a problem or not depends. If seating bullet bearing into it, or FL sizing necks, it's likely a problem.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1908365, member: 1521"] Body sizing rolls brass up the case. Neck bushings contribute nothing to donut formation. Yes, and also when seating bullet bearing into donut area (but bad plan there). By process of manufacture, cases are thickest near webs, tapering to thinnest by case mouths. So it is normal for necks to be thicker near neck-shoulder junction than at mouths. In other words, a donut is built in initially. From there, it is our sizing that contributes to problem donut thickness. Upsizing necks causes thicker shoulder brass to become neck area (donut formation). Heavy sizing of case bodies rolls brass thick toward thin (up the case). Donuts being a problem or not depends. If seating bullet bearing into it, or FL sizing necks, it's likely a problem. [/QUOTE]
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Reloading
How to Identify a Neck Donut?
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