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Rifles, Reloading, Optics, Equipment
Reloading
Brass sizing question
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<blockquote data-quote="Mikecr" data-source="post: 2078223" data-attributes="member: 1521"><p>Donuts (greater thickness near neck-shoulder junction than mouths) are inherent to case manufacture. </p><p>All new brass tapers in thickness from webs to mouths.</p><p>But even if you turn necks, there is nothing 'good' in FL sizing of necks (only bad).</p><p></p><p>Where you size beyond seated bullet bearing, you cause unexpanded neck to bind the bullet's bearing-base junction. This is not tension, it's binding.</p><p>In this scenario you're also bringing donut thickness (which is inconsistent) into play, for inconsistent tension.</p><p></p><p>The ONLY place where FL sizing of necks is at all helpful, is with competitive underbores needing extreme peak pressures to perform. With these, they need extreme bullet hold to jack up starting pressures. It works there because diminished returns from all this pressure also equals diminished variance of returns -from <em>relatively</em> minor things(like tension variances, powder variances, etc.).</p><p>None of this applies as 'good' for hunting capacity cartridges.</p><p>You could never pull off the same tricks with a 30-06 that you can with a 30BR.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2078223, member: 1521"] Donuts (greater thickness near neck-shoulder junction than mouths) are inherent to case manufacture. All new brass tapers in thickness from webs to mouths. But even if you turn necks, there is nothing 'good' in FL sizing of necks (only bad). Where you size beyond seated bullet bearing, you cause unexpanded neck to bind the bullet's bearing-base junction. This is not tension, it's binding. In this scenario you're also bringing donut thickness (which is inconsistent) into play, for inconsistent tension. The ONLY place where FL sizing of necks is at all helpful, is with competitive underbores needing extreme peak pressures to perform. With these, they need extreme bullet hold to jack up starting pressures. It works there because diminished returns from all this pressure also equals diminished variance of returns -from [I]relatively[/I] minor things(like tension variances, powder variances, etc.). None of this applies as 'good' for hunting capacity cartridges. You could never pull off the same tricks with a 30-06 that you can with a 30BR. [/QUOTE]
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Brass sizing question
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