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Rifles, Reloading, Optics, Equipment
Reloading
Help me determine what is causing my runout!
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<blockquote data-quote="Mikecr" data-source="post: 304098" data-attributes="member: 1521"><p>All I'm saying is the runout may not be bent necks. Or necks off center. It could be both.. Or the case bodies can form into bananas(because of springback variance, due to thickness variance), throwing everything out.</p><p>There could be a combination of these things among others adding and subtracting in ways that don't just go up and down.</p><p>This isn't lathe turned stock, it's pressure formed.</p><p></p><p>For example, an angle might counteract an offset, or add to it. Let's say one or the other is significant. Until it's specifically measured, you couldn't really generalize about it. You can't just divide runout in half, because you could actually have more than that, it's just being counteracted by the other contributor.</p><p>You don't run into this often in machining, because only one parameter is being changed at a time. Step by step by step.</p><p>And identifying runout is similar in that you go backwards through the steps.</p><p></p><p>Now you could have a die issue, shellholder, or more common press alignment issues. The seater plug might be a contributor.. Good things to checkout.</p><p>But the base of all runout, even with all else perfect, is case thickness variance. It runs full length of the case. With this, runout will occur and grow with each firing, and with each contact with any die. </p><p>The devil here is springback, and if your not considering what's happening in that regard you might convince yourself of a die issue that isn't. The die is just releasing an inconsistent tension, and there is nothing I know of that can fix it. There are only things done to reduce the rate of runout growth(like neck turning & minimal sizing).</p><p></p><p>The fella starting this discussion mentioned runout before dies even touched the brass. This is significant in that it's independent of what has been discussed so far, unless he FL sized before fire-forming. I think he should go back to that. Fix that first.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 304098, member: 1521"] All I'm saying is the runout may not be bent necks. Or necks off center. It could be both.. Or the case bodies can form into bananas(because of springback variance, due to thickness variance), throwing everything out. There could be a combination of these things among others adding and subtracting in ways that don't just go up and down. This isn't lathe turned stock, it's pressure formed. For example, an angle might counteract an offset, or add to it. Let's say one or the other is significant. Until it's specifically measured, you couldn't really generalize about it. You can't just divide runout in half, because you could actually have more than that, it's just being counteracted by the other contributor. You don't run into this often in machining, because only one parameter is being changed at a time. Step by step by step. And identifying runout is similar in that you go backwards through the steps. Now you could have a die issue, shellholder, or more common press alignment issues. The seater plug might be a contributor.. Good things to checkout. But the base of all runout, even with all else perfect, is case thickness variance. It runs full length of the case. With this, runout will occur and grow with each firing, and with each contact with any die. The devil here is springback, and if your not considering what's happening in that regard you might convince yourself of a die issue that isn't. The die is just releasing an inconsistent tension, and there is nothing I know of that can fix it. There are only things done to reduce the rate of runout growth(like neck turning & minimal sizing). The fella starting this discussion mentioned runout before dies even touched the brass. This is significant in that it's independent of what has been discussed so far, unless he FL sized before fire-forming. I think he should go back to that. Fix that first. [/QUOTE]
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Help me determine what is causing my runout!
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