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Rifles, Reloading, Optics, Equipment
Reloading
21st Century Concentricity Tool
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<blockquote data-quote="Mikecr" data-source="post: 2034530" data-attributes="member: 1521"><p>There are a couple things important with this;</p><p></p><p>1. Forget concentricity and don't subtract or cheat from your raw readings. Total indicated runout is just that.</p><p>There is a lot more to it than necks, or bullet seating. These V-Block gauges show all deviation FROM STRAIGHT. </p><p>When you make straight ammo, it is low in TIR, and if it helps you sleep that is also low in concentricity as well.</p><p>Keep in mind, a cinder block can be centered up concentric between 2 points, but it is not straight. It would not chamber well in a cylinder. Think no runout = dead straight = best you can do.</p><p></p><p>2. Runout matters only when exceeding chamber clearances. The reason it matters then is because it sets up chambered pressure points. You may think then that sloppy clearances are the way to go -except it is sloppy clearances and all the sizing needed from this, that leads to higher runout. </p><p>Either direction tight or loose are circles feeding on themselves. One circle is big, one small, both just fine the way they are.</p><p>You can have big runout in a sloppy chamber that created it and doesn't punish you about it.</p><p>You can have very little runout in a tighter chamber that produces less runout, and all is great there too.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2034530, member: 1521"] There are a couple things important with this; 1. Forget concentricity and don't subtract or cheat from your raw readings. Total indicated runout is just that. There is a lot more to it than necks, or bullet seating. These V-Block gauges show all deviation FROM STRAIGHT. When you make straight ammo, it is low in TIR, and if it helps you sleep that is also low in concentricity as well. Keep in mind, a cinder block can be centered up concentric between 2 points, but it is not straight. It would not chamber well in a cylinder. Think no runout = dead straight = best you can do. 2. Runout matters only when exceeding chamber clearances. The reason it matters then is because it sets up chambered pressure points. You may think then that sloppy clearances are the way to go -except it is sloppy clearances and all the sizing needed from this, that leads to higher runout. Either direction tight or loose are circles feeding on themselves. One circle is big, one small, both just fine the way they are. You can have big runout in a sloppy chamber that created it and doesn't punish you about it. You can have very little runout in a tighter chamber that produces less runout, and all is great there too. [/QUOTE]
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Reloading
21st Century Concentricity Tool
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