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Rifles, Reloading, Optics, Equipment
Reloading
Neck turning...min neck thickness
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<blockquote data-quote="Mikecr" data-source="post: 1937247" data-attributes="member: 1521"><p>I'll add something here,,, not trying to annoy anyone, but:</p><p>Needing more neck clearance than bullet release requires is nothing more than a mob notion.</p><p>We don't actually NEED more clearance than you can well manage.</p><p></p><p>What holds your bullets is the gripping hoop force of neck springback against .XXX area of seated bearing.</p><p>What releases your bullets is neck expansion due to pressure.</p><p>How much does a neck have to expand to release bullet bearing?</p><p>This would be hard to measure, but as long as the brass and jacket molecules are not in chemical bind, then a millionth of an inch separation might as well be a mile. A bullet is freely swingin in the wind by then.</p><p>How much pressure does it take to expand a neck a millionth of an inch?</p><p>Well, it's little relative to peak chamber pressure.</p><p></p><p>The only way to delay this release is to establish an interference fit (negative clearance) so that a neck could not expand AT ALL. Of course that's a VERY dangerous condition.</p><p>And since your management of field clearances includes +/- relative miles, it is prudent to provide plenty enough clearance.</p><p></p><p>I can & do manage 0.0005"(1/2thou) of neck clearance (fitted neck) for one of my guns. No problem.</p><p>For others, not MY chambers, 1-3thou is reasonable.</p><p>This does not affect pressures, and I'm confident that no human will ever prove it can.</p><p>There is no basis for more <u>neck</u> clearance resulting in lower pressure.</p><p>What I'm trying to relay here is that you do not HAVE TO produce more clearance, and that you're not really hurting anything (pressure-wise) with less. It's not really anything to be terrified of.</p><p></p><p>Now it is bad to results if your loaded runout exceeds clearances, as this causes chambered pressure points.</p><p>But keep in mind, the tighter your clearances, the straighter your ammo. This is How I easily manage 1/2thou of clearances. The case runout from that chamber is too low to measure without abnormal procedure and tools.</p><p>This is as self-perpetuating as large clearances are to large runout.</p><p>So again, nothing to be worried about really.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1937247, member: 1521"] I'll add something here,,, not trying to annoy anyone, but: Needing more neck clearance than bullet release requires is nothing more than a mob notion. We don't actually NEED more clearance than you can well manage. What holds your bullets is the gripping hoop force of neck springback against .XXX area of seated bearing. What releases your bullets is neck expansion due to pressure. How much does a neck have to expand to release bullet bearing? This would be hard to measure, but as long as the brass and jacket molecules are not in chemical bind, then a millionth of an inch separation might as well be a mile. A bullet is freely swingin in the wind by then. How much pressure does it take to expand a neck a millionth of an inch? Well, it's little relative to peak chamber pressure. The only way to delay this release is to establish an interference fit (negative clearance) so that a neck could not expand AT ALL. Of course that's a VERY dangerous condition. And since your management of field clearances includes +/- relative miles, it is prudent to provide plenty enough clearance. I can & do manage 0.0005"(1/2thou) of neck clearance (fitted neck) for one of my guns. No problem. For others, not MY chambers, 1-3thou is reasonable. This does not affect pressures, and I'm confident that no human will ever prove it can. There is no basis for more [U]neck[/U] clearance resulting in lower pressure. What I'm trying to relay here is that you do not HAVE TO produce more clearance, and that you're not really hurting anything (pressure-wise) with less. It's not really anything to be terrified of. Now it is bad to results if your loaded runout exceeds clearances, as this causes chambered pressure points. But keep in mind, the tighter your clearances, the straighter your ammo. This is How I easily manage 1/2thou of clearances. The case runout from that chamber is too low to measure without abnormal procedure and tools. This is as self-perpetuating as large clearances are to large runout. So again, nothing to be worried about really. [/QUOTE]
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Neck turning...min neck thickness
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