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Rifles, Reloading, Optics, Equipment
Reloading
neck tension on a 7mm Allen
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<blockquote data-quote="Mikecr" data-source="post: 449067" data-attributes="member: 1521"><p>Well, before you write it off, you might consider that springback IS your tension. </p><p>And that it's exactly all the tension you have.</p><p></p><p>When you seat a bullet, you are upsizing a neck. What holds that bullet in place is the SPRINGBACK from this upsizing, which tops out at 1.5-2thou interference depending on the brass work hardness, and regardless of 'oversizing'.</p><p>Don't believe me?</p><p>Measure a normally sized & loaded neck OD. Pull the bullet, measure unloaded OD & neck down further an extreme amount,, say another 5-6thou under. Now seat a bullet. It will be very difficult to seat because of all the upsizing you're doing here, but once seated the loaded neck OD measures the same as before.</p><p>So now, is there greater bullet grip than normal?</p><p>NO THERE IS NOT</p><p>Pull the bullet, and measure how much the neck springs back. It will be 1-2thou under, with the same unloaded OD as with normal sizing. That is your tension, and it's entirely springback.</p><p></p><p>Now do the same right after annealing, and you will measure LESS springback after pulling the bullet.</p><p>If you over anneal a case, there will be maybe a half thou springback, to none at all...</p><p>This is LESS tension.</p><p>Further annealing will not fix this. The necks will have to be re-work hardened to regain normal springback.</p><p></p><p>That's about as much effort as I care to waste here...</p></blockquote><p></p>
[QUOTE="Mikecr, post: 449067, member: 1521"] Well, before you write it off, you might consider that springback IS your tension. And that it's exactly all the tension you have. When you seat a bullet, you are upsizing a neck. What holds that bullet in place is the SPRINGBACK from this upsizing, which tops out at 1.5-2thou interference depending on the brass work hardness, and regardless of 'oversizing'. Don't believe me? Measure a normally sized & loaded neck OD. Pull the bullet, measure unloaded OD & neck down further an extreme amount,, say another 5-6thou under. Now seat a bullet. It will be very difficult to seat because of all the upsizing you're doing here, but once seated the loaded neck OD measures the same as before. So now, is there greater bullet grip than normal? NO THERE IS NOT Pull the bullet, and measure how much the neck springs back. It will be 1-2thou under, with the same unloaded OD as with normal sizing. That is your tension, and it's entirely springback. Now do the same right after annealing, and you will measure LESS springback after pulling the bullet. If you over anneal a case, there will be maybe a half thou springback, to none at all... This is LESS tension. Further annealing will not fix this. The necks will have to be re-work hardened to regain normal springback. That's about as much effort as I care to waste here... [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
neck tension on a 7mm Allen
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