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Rifles, Reloading, Optics, Equipment
Reloading
Runout issues with Redding Comp Bushing die
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<blockquote data-quote="Mikecr" data-source="post: 414879" data-attributes="member: 1521"><p>Yes, it's too much sizing for a single bushing.</p><p>.340 fired, means the chamber neck was atleast .342 with springback, and that is pretty sloppy for a 308. Well, maybe not for something tactical..</p><p>Also, never assume anything, about anything. Measure your brass thickness for it's variance.</p><p>All the oversizing sizing you're doing here is amplifying thickness variance. The same happens to the body of cases with alot of thickness variance, that are heavily full length sized. Runaway runout...</p><p></p><p>This brings up another point:</p><p>You cannot just halve your TIR!</p><p>Runout is not concentricity..</p><p>Runout is just what it is, and total rounout is just that. TOTAL..</p><p></p><p>TIR is the result of more than just one offset, and can be independent of centerline. It is the sum of offsets and measurement error.</p><p>With this, it cannot be assumed that your necks are 'not centered' if you have thickness variance, or the cases aren't straight, or the case heads(taken as a datum) are not square, or the bullets aren't seated straight. These potential offsets and errors combine to produce what you have(not half of it).</p><p></p><p>It is not always easy to measure offsets individually. But you can recognize the worst in your system's results, and do alot of things to improve it.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 414879, member: 1521"] Yes, it's too much sizing for a single bushing. .340 fired, means the chamber neck was atleast .342 with springback, and that is pretty sloppy for a 308. Well, maybe not for something tactical.. Also, never assume anything, about anything. Measure your brass thickness for it's variance. All the oversizing sizing you're doing here is amplifying thickness variance. The same happens to the body of cases with alot of thickness variance, that are heavily full length sized. Runaway runout... This brings up another point: You cannot just halve your TIR! Runout is not concentricity.. Runout is just what it is, and total rounout is just that. TOTAL.. TIR is the result of more than just one offset, and can be independent of centerline. It is the sum of offsets and measurement error. With this, it cannot be assumed that your necks are 'not centered' if you have thickness variance, or the cases aren't straight, or the case heads(taken as a datum) are not square, or the bullets aren't seated straight. These potential offsets and errors combine to produce what you have(not half of it). It is not always easy to measure offsets individually. But you can recognize the worst in your system's results, and do alot of things to improve it. [/QUOTE]
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Reloading
Runout issues with Redding Comp Bushing die
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