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Rifles, Reloading, Optics, Equipment
Reloading
Case/Bullet Run-out: How Big a Deal Is It?
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<blockquote data-quote="Mikecr" data-source="post: 355783" data-attributes="member: 1521"><p>There is a difference between Thickness variance, Runout, and Concentricity, that seems to be getting muddled around.</p><p></p><p>Sinclair's ball mic(either with a stand, NOT the cheap indicator version), checks thickness variance of the brass at the necks. The percentage of variance there runs full length.</p><p>This shows up with each cycling of the brass(firing/sizing), as growing runout that can never be fixed. First stage of my brass culling.</p><p></p><p>Sinclair's 'concentricity' gage is really a 'Runout' gage(and the best of em). It measures any and all runout irregardless of overall centerline. Your cartridge is not STRAIGHT until measured so on a Sinclair.</p><p></p><p>The true concentricity gages(like the H&H), measure w/resp to a pinned centerline. This shows only how concentric a loaded cartridge is. They DO NOT measure runout, and in fact mask most of it.</p><p></p><p>A cartridge can be concentric and still have a great deal of runout. But if a cartridge is straight(no runout), it is concentric as well.</p><p>Given this, and all the ways a cartidge can rest and point in a chamber, I believe STRAIGHT is as good as it gets.</p><p>This is what you should strive for.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 355783, member: 1521"] There is a difference between Thickness variance, Runout, and Concentricity, that seems to be getting muddled around. Sinclair's ball mic(either with a stand, NOT the cheap indicator version), checks thickness variance of the brass at the necks. The percentage of variance there runs full length. This shows up with each cycling of the brass(firing/sizing), as growing runout that can never be fixed. First stage of my brass culling. Sinclair's 'concentricity' gage is really a 'Runout' gage(and the best of em). It measures any and all runout irregardless of overall centerline. Your cartridge is not STRAIGHT until measured so on a Sinclair. The true concentricity gages(like the H&H), measure w/resp to a pinned centerline. This shows only how concentric a loaded cartridge is. They DO NOT measure runout, and in fact mask most of it. A cartridge can be concentric and still have a great deal of runout. But if a cartridge is straight(no runout), it is concentric as well. Given this, and all the ways a cartidge can rest and point in a chamber, I believe STRAIGHT is as good as it gets. This is what you should strive for. [/QUOTE]
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Reloading
Case/Bullet Run-out: How Big a Deal Is It?
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