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Rifles, Reloading, Optics, Equipment
Reloading
Concentricity:How much ?
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<blockquote data-quote="Mikecr" data-source="post: 360208" data-attributes="member: 1521"><p>Why on earth would you 'restrain' what you're trying to measure?</p><p>You're masking variance. This is why your numbers are so low. </p><p>Sounds like you're using a concentricity gage rather than a Runout gage.</p><p></p><p>As a note, the Sinclair 'Concentricity' gage is actually a 'Runout' gage.</p><p></p><p>Why are you guys FL sizing NEW brass & culling by runout?</p><p>New brass could measure any runout, even if turned, until it has been fire-formed into it's final product. </p><p></p><p>#1 Stop FL sizing new brass. It is wasted time.</p><p>#2 To see your brass at it's lowest runout(it's best potential), measure it after fireforming, & before doing anything to it.</p><p>#3 Measure after each sizing stage to see the specific runout contributor</p><p>#4 Measure loaded runout off the ogive at a point near land contact, with the bullet unrestrained. Don't assume anything about the neck, or even think about it at this point. </p><p>Think TIR off the ogives.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 360208, member: 1521"] Why on earth would you 'restrain' what you're trying to measure? You're masking variance. This is why your numbers are so low. Sounds like you're using a concentricity gage rather than a Runout gage. As a note, the Sinclair 'Concentricity' gage is actually a 'Runout' gage. Why are you guys FL sizing NEW brass & culling by runout? New brass could measure any runout, even if turned, until it has been fire-formed into it's final product. #1 Stop FL sizing new brass. It is wasted time. #2 To see your brass at it's lowest runout(it's best potential), measure it after fireforming, & before doing anything to it. #3 Measure after each sizing stage to see the specific runout contributor #4 Measure loaded runout off the ogive at a point near land contact, with the bullet unrestrained. Don't assume anything about the neck, or even think about it at this point. Think TIR off the ogives. [/QUOTE]
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Concentricity:How much ?
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