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Rifles, Reloading, Optics, Equipment
Reloading
21st Century Concentricity Tool
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<blockquote data-quote="Howland" data-source="post: 2033989" data-attributes="member: 103509"><p>I have the 21st Century tool with the wheel. Yes you have to set the wheel slightly offset to 90° to avoid the case moving forward. It's a nice tool and worth the money. </p><p></p><p>I measured in the middle of the neck and a point halfway between the ogive and tip. Neck concentricity showed 0 to 0.0015" out of round, about the same as measured neck wall thickness. Bullets showed 0 to 0.0085" variation, or 0.00425" TIR. This clearly points to the seating process as inducing runout. </p><p></p><p>I sorted 50 measured rounds by runout, best (almost none) to worst, and the worst shot a slightly smaller group than the almost none. </p><p></p><p>The concentricity tester now sits on a shelf collecting dust until I improve my fundamentals enough so the variation induced by the nut that holds the trigger has been reduced enough so it no longer obscures the other sources of variation (loading process, tools and components).</p><p></p><p>It was worth the price to confirm that. I had thought I was a pretty good shooter but needed more expensive reloading gear. Looking at it from that perspective, it saved me money.</p></blockquote><p></p>
[QUOTE="Howland, post: 2033989, member: 103509"] I have the 21st Century tool with the wheel. Yes you have to set the wheel slightly offset to 90° to avoid the case moving forward. It's a nice tool and worth the money. I measured in the middle of the neck and a point halfway between the ogive and tip. Neck concentricity showed 0 to 0.0015" out of round, about the same as measured neck wall thickness. Bullets showed 0 to 0.0085" variation, or 0.00425" TIR. This clearly points to the seating process as inducing runout. I sorted 50 measured rounds by runout, best (almost none) to worst, and the worst shot a slightly smaller group than the almost none. The concentricity tester now sits on a shelf collecting dust until I improve my fundamentals enough so the variation induced by the nut that holds the trigger has been reduced enough so it no longer obscures the other sources of variation (loading process, tools and components). It was worth the price to confirm that. I had thought I was a pretty good shooter but needed more expensive reloading gear. Looking at it from that perspective, it saved me money. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
21st Century Concentricity Tool
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