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Rifles, Reloading, Optics, Equipment
Reloading
Sinclair Concentricity Gauge
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<blockquote data-quote="QuietTexan" data-source="post: 2375301" data-attributes="member: 116181"><p>Works in sizing steps also. Size once, rotate, size a second time. Mandrel in and out, rotate 90*, mandrel in and out again. </p><p></p><p>My assumption is that this has to do with applying any eccentricities in the die or mandrel to two points in the case sequentially, and ending up with an ultimately less precise but better average size.</p><p></p><p>How do you get a flat rock if you have nothing but not-flat rocks? You grind three at a time. How do you get a round object from not round objects? You squeeze it in multiple directions so it averages out.</p><p>[URL unfurl="true"]https://ericweinhoffer.com/blog/2017/7/30/the-whitworth-three-plates-method[/URL]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2375301, member: 116181"] Works in sizing steps also. Size once, rotate, size a second time. Mandrel in and out, rotate 90*, mandrel in and out again. My assumption is that this has to do with applying any eccentricities in the die or mandrel to two points in the case sequentially, and ending up with an ultimately less precise but better average size. How do you get a flat rock if you have nothing but not-flat rocks? You grind three at a time. How do you get a round object from not round objects? You squeeze it in multiple directions so it averages out. [URL unfurl="true"]https://ericweinhoffer.com/blog/2017/7/30/the-whitworth-three-plates-method[/URL] [/QUOTE]
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Reloading
Sinclair Concentricity Gauge
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