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Rifles, Reloading, Optics, Equipment
Reloading
Excessive bullet run out. How to remedy?
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<blockquote data-quote="Mikecr" data-source="post: 672881" data-attributes="member: 1521"><p>No, we're not checking 'roundness'.</p><p>Our cartridges are not solid stock being turned to something centered on a lathe. They are tubes FORMED to something free from any center-line in our chamber & dies.</p><p></p><p>The best we can do is make STRAIGHT loaded ammo. </p><p>Straight ammo is also concentric ammo. </p><p>But concentric ammo is NOT straight, until measured so.</p><p>We can not subtract opposing readings with out of round assumptions, or bend one end of ammo and assume it's straight from one end to the other. It don't work that way.</p><p>Straight is just that, no bends/added stresses, and it passes all tests.</p><p></p><p>You 'fix' your forming process, and verify that formed is straight with measure.</p><p>It doesn't take smoke & mirrors, it takes methodic investigation and adjustment of your processes. I do this until my ammo is straight with every cartridge, and I've never regretted it.</p><p></p><p>A factory stamps out widgets, like we are doing here, and QC finds they aren't conforming to spec.</p><p>American QC(not red communist Chinese QC) does NOT go to bending widgets so that the out of conformance measure is 'technically' SAT -with required number of samples.</p><p>They stop the line, get together with maint/engineering, investigate/determine the cause, take appropriate actions to remove the cause, and verify they've mitigated further problems.</p><p>Just sayin, there is a right and wrong way to approach this.</p><p></p><p>As far as indicator accuracy here, anything under .0001 is usually masked by surface profile. I've tried it, it didn't work well for brass cases/bullet jackets.</p><p>I keep going back to .0005, as it provides resolution I can believe and mind for quick checks.</p><p>My only concern is >1thou of TIR, as I don't keep ammo beyond this.</p><p>If I had several in a batch that went there, I'd stop and find out what the schmuck(WTS).</p></blockquote><p></p>
[QUOTE="Mikecr, post: 672881, member: 1521"] No, we're not checking 'roundness'. Our cartridges are not solid stock being turned to something centered on a lathe. They are tubes FORMED to something free from any center-line in our chamber & dies. The best we can do is make STRAIGHT loaded ammo. Straight ammo is also concentric ammo. But concentric ammo is NOT straight, until measured so. We can not subtract opposing readings with out of round assumptions, or bend one end of ammo and assume it's straight from one end to the other. It don't work that way. Straight is just that, no bends/added stresses, and it passes all tests. You 'fix' your forming process, and verify that formed is straight with measure. It doesn't take smoke & mirrors, it takes methodic investigation and adjustment of your processes. I do this until my ammo is straight with every cartridge, and I've never regretted it. A factory stamps out widgets, like we are doing here, and QC finds they aren't conforming to spec. American QC(not red communist Chinese QC) does NOT go to bending widgets so that the out of conformance measure is 'technically' SAT -with required number of samples. They stop the line, get together with maint/engineering, investigate/determine the cause, take appropriate actions to remove the cause, and verify they've mitigated further problems. Just sayin, there is a right and wrong way to approach this. As far as indicator accuracy here, anything under .0001 is usually masked by surface profile. I've tried it, it didn't work well for brass cases/bullet jackets. I keep going back to .0005, as it provides resolution I can believe and mind for quick checks. My only concern is >1thou of TIR, as I don't keep ammo beyond this. If I had several in a batch that went there, I'd stop and find out what the schmuck(WTS). [/QUOTE]
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Reloading
Excessive bullet run out. How to remedy?
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