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Rifles, Reloading, Optics, Equipment
Reloading
Partial neck sizing - a problem?
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<blockquote data-quote="30BR" data-source="post: 1927881" data-attributes="member: 64079"><p>He is talking about seating bullets, and total neck tension. Usually the donut rears its ugly head in cases that have been neck turned. Reason being that the neck wall has been made considerably thinner than the shoulder wall. Over time, as cases grow with firings, this thicker wall flows forward into the neck area. Complete neck sizing will push the extra thickness to the INSIDE on the neck. IF you are trying to seat the bullet deeper into the case than the base of the neck, this "donut" will physically stop the bullet from going deeper. You then need to remove it by reaming, or running the case over a mandrel to push it to the outside where it can be turned down to match the rest of the neck. But if you are seating the bullet ABOVE that contact area, it plays little role. </p><p>When he talks about not fully sizing the neck, he's leaving that donut area untouched, so that it won't interfere with deep seated bullets (depending on the thickness of the donut relative to the neck wall), as well as limiting the length of the neck that is sized to grip the bullet. If you can't make the ID of the neck larger, by not sizing as much of the neck, there will be less overall clamping force exerted on the bullet the less it is sized longitudinally.</p><p>Hope that helps..</p></blockquote><p></p>
[QUOTE="30BR, post: 1927881, member: 64079"] He is talking about seating bullets, and total neck tension. Usually the donut rears its ugly head in cases that have been neck turned. Reason being that the neck wall has been made considerably thinner than the shoulder wall. Over time, as cases grow with firings, this thicker wall flows forward into the neck area. Complete neck sizing will push the extra thickness to the INSIDE on the neck. IF you are trying to seat the bullet deeper into the case than the base of the neck, this "donut" will physically stop the bullet from going deeper. You then need to remove it by reaming, or running the case over a mandrel to push it to the outside where it can be turned down to match the rest of the neck. But if you are seating the bullet ABOVE that contact area, it plays little role. When he talks about not fully sizing the neck, he's leaving that donut area untouched, so that it won't interfere with deep seated bullets (depending on the thickness of the donut relative to the neck wall), as well as limiting the length of the neck that is sized to grip the bullet. If you can't make the ID of the neck larger, by not sizing as much of the neck, there will be less overall clamping force exerted on the bullet the less it is sized longitudinally. Hope that helps.. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Partial neck sizing - a problem?
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