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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
School me on "the doughnut "
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<blockquote data-quote="Mikecr" data-source="post: 1250314" data-attributes="member: 1521"><p>Rubbish..</p><p>The unsized portion of a partially sized neck is not a 'donut'. It is merely unsized area.</p><p>Brass also does not 'migrate' into donut area. It is put there with neck upsizing and with heavy sizing of high body taper/low shoulder angle cases. This rolling, thick toward thin, is what you trim away when you cause it -through sizing (not all of us do).</p><p></p><p>OP, new brass varies in thickness inherent to it's manufacture, tapering from thickest at the webs, and thinning all the way to case mouths. So all brass comes with donut area in necks, as they are thicker nearest the neck-shoulder junction. Some of us turn necks to desired thickness which can remove and mitigate future donuts where done correctly. When we turn, we do so full length of necks and slightly up onto shoulders. This, because once the shoulder and neck expand on first firing, some of the shoulder becomes new neck area. That shoulder brass would have continued in thickness taper, so it would have been thicker, recreating a donut.</p><p>Anyway, donut area is only an issue when we make it so. Seating bullet bearing into it is a common problem for tension(bullet grip) and sometimes chamber fit. FL sizing of necks brings thicker donut brass into neck tension, regardless of seated bearing.</p><p>So the best way to avoid donuts as a 'problem' is to avoid seating bullet bearing near neck-shoulder junction, and to partially neck size -with bushings.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1250314, member: 1521"] Rubbish.. The unsized portion of a partially sized neck is not a 'donut'. It is merely unsized area. Brass also does not 'migrate' into donut area. It is put there with neck upsizing and with heavy sizing of high body taper/low shoulder angle cases. This rolling, thick toward thin, is what you trim away when you cause it -through sizing (not all of us do). OP, new brass varies in thickness inherent to it's manufacture, tapering from thickest at the webs, and thinning all the way to case mouths. So all brass comes with donut area in necks, as they are thicker nearest the neck-shoulder junction. Some of us turn necks to desired thickness which can remove and mitigate future donuts where done correctly. When we turn, we do so full length of necks and slightly up onto shoulders. This, because once the shoulder and neck expand on first firing, some of the shoulder becomes new neck area. That shoulder brass would have continued in thickness taper, so it would have been thicker, recreating a donut. Anyway, donut area is only an issue when we make it so. Seating bullet bearing into it is a common problem for tension(bullet grip) and sometimes chamber fit. FL sizing of necks brings thicker donut brass into neck tension, regardless of seated bearing. So the best way to avoid donuts as a 'problem' is to avoid seating bullet bearing near neck-shoulder junction, and to partially neck size -with bushings. [/QUOTE]
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School me on "the doughnut "
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