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Rifles, Reloading, Optics, Equipment
Reloading
Checking case wall runout
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<blockquote data-quote="Mikecr" data-source="post: 255979" data-attributes="member: 1521"><p>I'm not a competitor, but this is what I do to get right to the best brass in a lot:</p><p></p><p>For one, I use Sinclair tools, and to begin I measure thickness variance at the necks on 1000 pieces in a lot. This is a micrometer with a ball anvil and stand.</p><p>There is no need to fireform beforehand(for this cull).</p><p>I usually end up with ~150 pieces showing almost no variance in thickness.</p><p>If there was, I assure you it runs full length of the case, and will produce bananas down the road.</p><p></p><p>Then I prep(incl turning), and fireform these 150 pieces. When I pull em out of the chamber and drop em on Sinclair's concentricity gauge(bearings and dial indicator) they will show ZERO TIR. That is <5-ten-thou, as you cannot measure less on unpolished brass.</p><p>At this point I measure H20 capacity on each, and end up with ~85 pieces that match.</p><p></p><p>That's 85 jewels right there.</p><p>With custom dies -made with your reamers, you can wear out many barrels with them. </p><p>With the right load and an Oehler/20ft screen spacing, you'll see under 10fps of ES from these.</p><p>Using a Wilson seater blank cut with your finish reamer, and running each round over a Sinclair expander mandrel prior to each seating, you can produce loaded ammo with <1thou TIR off mid ogives. </p><p></p><p>I rake the rest into the trash, simple as that. </p><p>Brass is cheap.</p><p></p><p>I'll say here that Sinclair's tools are not bettered out there. Yes, there are fancier and more expensive turning and measuring systems.. Lotta pretty colors and promises...</p><p>None better than offerred by Sinclair.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 255979, member: 1521"] I'm not a competitor, but this is what I do to get right to the best brass in a lot: For one, I use Sinclair tools, and to begin I measure thickness variance at the necks on 1000 pieces in a lot. This is a micrometer with a ball anvil and stand. There is no need to fireform beforehand(for this cull). I usually end up with ~150 pieces showing almost no variance in thickness. If there was, I assure you it runs full length of the case, and will produce bananas down the road. Then I prep(incl turning), and fireform these 150 pieces. When I pull em out of the chamber and drop em on Sinclair's concentricity gauge(bearings and dial indicator) they will show ZERO TIR. That is <5-ten-thou, as you cannot measure less on unpolished brass. At this point I measure H20 capacity on each, and end up with ~85 pieces that match. That's 85 jewels right there. With custom dies -made with your reamers, you can wear out many barrels with them. With the right load and an Oehler/20ft screen spacing, you'll see under 10fps of ES from these. Using a Wilson seater blank cut with your finish reamer, and running each round over a Sinclair expander mandrel prior to each seating, you can produce loaded ammo with <1thou TIR off mid ogives. I rake the rest into the trash, simple as that. Brass is cheap. I'll say here that Sinclair's tools are not bettered out there. Yes, there are fancier and more expensive turning and measuring systems.. Lotta pretty colors and promises... None better than offerred by Sinclair. [/QUOTE]
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