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Rifles, Reloading, Optics, Equipment
Reloading
Redding bushing neck sizing die
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<blockquote data-quote="PddPdd" data-source="post: 2377143" data-attributes="member: 111799"><p>Annealing of brass softens the material. Material engineers would say it is more ductile, making it easier to bend and take on a new shape because of it's reduced temper/strength.</p><p>Note: This is why one should only anneal the neck of the brass.</p><p>Softened brass will readily take on a new shape with less force and stay in that shape as compared to brass that has been work hardened by multiple firings. Work hardened brass will exhibit more spring-back because it is harder and more brittle. In this discussion brittle and ductile are opposites.</p><p></p><p>I believe Old rooster is correct in saying that spring back does create more neck tension/gripping force on the bullet than annealed brass so that is one factor in bullet grip.</p><p></p><p>I believe Mikecr has pointed out numerous times that the amount of the neck that is bushing sized is a bigger factor for neck tension than the gripping force. The<strong> amount</strong> of neck length bushing sized is what <strong>micrometer </strong>bushing dies control for the reloader.</p><p></p><p>In my thinking, one would have to know what is happening in the chamber at the point of bullet release.</p><p>1) does the chamber pressure expand the case neck to release the bullet or</p><p>2) does the chamber pressure overcome the neck gripping force and force the bullet out or</p><p>3) a combination of 1 & 2.</p><p></p><p>I believe the reason many reloaders anneal their brass after every firing is for brass consistency because every time the brass is fired it work hardens a little or a lot more depending on how much deformation it is being exposed to. Annealing returns the brass to the same starting point after every firing.</p><p></p><p>If one does not anneal their brass ever, eventually the brass will work harden to the point where it becomes too work hardened/brittle and cracks due to the pressure and resulting deformation from firing.</p><p></p><p>Hope this clarifies a few things and invites those with more knowledge to share.</p><p></p><p>Merry Christmas!</p></blockquote><p></p>
[QUOTE="PddPdd, post: 2377143, member: 111799"] Annealing of brass softens the material. Material engineers would say it is more ductile, making it easier to bend and take on a new shape because of it's reduced temper/strength. Note: This is why one should only anneal the neck of the brass. Softened brass will readily take on a new shape with less force and stay in that shape as compared to brass that has been work hardened by multiple firings. Work hardened brass will exhibit more spring-back because it is harder and more brittle. In this discussion brittle and ductile are opposites. I believe Old rooster is correct in saying that spring back does create more neck tension/gripping force on the bullet than annealed brass so that is one factor in bullet grip. I believe Mikecr has pointed out numerous times that the amount of the neck that is bushing sized is a bigger factor for neck tension than the gripping force. The[B] amount[/B] of neck length bushing sized is what [B]micrometer [/B]bushing dies control for the reloader. In my thinking, one would have to know what is happening in the chamber at the point of bullet release. 1) does the chamber pressure expand the case neck to release the bullet or 2) does the chamber pressure overcome the neck gripping force and force the bullet out or 3) a combination of 1 & 2. I believe the reason many reloaders anneal their brass after every firing is for brass consistency because every time the brass is fired it work hardens a little or a lot more depending on how much deformation it is being exposed to. Annealing returns the brass to the same starting point after every firing. If one does not anneal their brass ever, eventually the brass will work harden to the point where it becomes too work hardened/brittle and cracks due to the pressure and resulting deformation from firing. Hope this clarifies a few things and invites those with more knowledge to share. Merry Christmas! [/QUOTE]
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Redding bushing neck sizing die
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