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Rifles, Reloading, Optics, Equipment
Reloading
To neck size or full length size???
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<blockquote data-quote="Pdvdh" data-source="post: 960502" data-attributes="member: 4191"><p>I've measured several resized case neck ODs, sized in the Forster die without the neck expander button. I'm reading ~0.243 to maybe 0.24375 on the resized case necks. The fired case necks were ~0.254" prior to resizing. The Forster die is stamped with a case neck ID dimension of 0.2435". I have no tool to measure that dimension. If it is honed to an ID of 0.2435", I'm not experiencing much post-compression rebound on these .223 case necks. .223 is a shorter case length and smaller diameter than most, so both would mean lesser spring back, in my mind.</p><p></p><p>I found it interesting to note that the case neck ODs on individual <u>resized case necks</u> varied close to 0.00075" on my dial calipers as I rotated the case neck in the calipers. This leads me to believe that case necks that haven't been turned to uniform neck wall thickness expand and rebound slightly differently at differing locations, due to uneven neck thickness and therefore differing elasticity. I think the larger resized case neck OD is likely being measured where the case neck wall thickness is greater, and the lower OD is being measured at locations where the case neck thickness is thinner. Perhaps another benefit of case neck turning for those that seek the ultimate consistency in case neck tension?</p><p></p><p>These .223 Rem cases were once fired R-P factory cartridges.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 960502, member: 4191"] I've measured several resized case neck ODs, sized in the Forster die without the neck expander button. I'm reading ~0.243 to maybe 0.24375 on the resized case necks. The fired case necks were ~0.254" prior to resizing. The Forster die is stamped with a case neck ID dimension of 0.2435". I have no tool to measure that dimension. If it is honed to an ID of 0.2435", I'm not experiencing much post-compression rebound on these .223 case necks. .223 is a shorter case length and smaller diameter than most, so both would mean lesser spring back, in my mind. I found it interesting to note that the case neck ODs on individual [U]resized case necks[/U] varied close to 0.00075" on my dial calipers as I rotated the case neck in the calipers. This leads me to believe that case necks that haven't been turned to uniform neck wall thickness expand and rebound slightly differently at differing locations, due to uneven neck thickness and therefore differing elasticity. I think the larger resized case neck OD is likely being measured where the case neck wall thickness is greater, and the lower OD is being measured at locations where the case neck thickness is thinner. Perhaps another benefit of case neck turning for those that seek the ultimate consistency in case neck tension? These .223 Rem cases were once fired R-P factory cartridges. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
To neck size or full length size???
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