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Concentricity Question
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<blockquote data-quote="Barrelnut" data-source="post: 1401071" data-attributes="member: 74902"><p>Have read stories of military competitors using that method when they had to use their military issue ammo for the match. They would roll the ammo on the table to find the high spot and mark it. Never tried it myself, but it might work, but would depend on how much the ammo varied and the degree of that variance.</p><p></p><p>If you suspect a concentric "runout" ammo issue, it would be a good idea to identify the cause of the runout and fix it. A lot of times runout is caused by the dies themselves. </p><p>* If you are using long pointed bullets like Berger VLDs, the seating stem may not rest on the bullet tip correctly and seat the bullet crooked.</p><p>* Dies that just "neck size" can cause the neck to be off-center from the case body.</p><p>* Full length sizing dies can pull the neck off-center with the expander ball.</p><p>* The length of the arm holding the expander ball can get to be an issue.</p><p>The list of things that can cause it goes on and on...</p><p></p><p>The Hornady Concentricity gauge will show that there is a problem, but not necessarily which step in the process this causing it. To find what, you need a gauge that can measure the case itself. Link below is to a gauge that is able to do that. You can measure the case body runout, the neck runout in relation to the case, and finally the runout with a seated bullet.</p><p><a href="https://www.brownells.com/reloading/measuring-tools/concentricity-gauges/concentricity-gauge-with-dial-indicator-sku749007305-37479-70547.aspx?cm_mmc=cse-_-Itwine-_-shopzilla-_-749-007-305&utm_medium=cse&utm_source=connexity&utm_campaign=itwine&utm_content=749-007-305" target="_blank">https://www.brownells.com/reloading/measuring-tools/concentricity-gauges/concentricity-gauge-with-dial-indicator-sku749007305-37479-70547.aspx?cm_mmc=cse-_-Itwine-_-shopzilla-_-749-007-305&utm_medium=cse&utm_source=connexity&utm_campaign=itwine&utm_content=749-007-305</a></p></blockquote><p></p>
[QUOTE="Barrelnut, post: 1401071, member: 74902"] Have read stories of military competitors using that method when they had to use their military issue ammo for the match. They would roll the ammo on the table to find the high spot and mark it. Never tried it myself, but it might work, but would depend on how much the ammo varied and the degree of that variance. If you suspect a concentric "runout" ammo issue, it would be a good idea to identify the cause of the runout and fix it. A lot of times runout is caused by the dies themselves. * If you are using long pointed bullets like Berger VLDs, the seating stem may not rest on the bullet tip correctly and seat the bullet crooked. * Dies that just "neck size" can cause the neck to be off-center from the case body. * Full length sizing dies can pull the neck off-center with the expander ball. * The length of the arm holding the expander ball can get to be an issue. The list of things that can cause it goes on and on... The Hornady Concentricity gauge will show that there is a problem, but not necessarily which step in the process this causing it. To find what, you need a gauge that can measure the case itself. Link below is to a gauge that is able to do that. You can measure the case body runout, the neck runout in relation to the case, and finally the runout with a seated bullet. [URL]https://www.brownells.com/reloading/measuring-tools/concentricity-gauges/concentricity-gauge-with-dial-indicator-sku749007305-37479-70547.aspx?cm_mmc=cse-_-Itwine-_-shopzilla-_-749-007-305&utm_medium=cse&utm_source=connexity&utm_campaign=itwine&utm_content=749-007-305[/URL] [/QUOTE]
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