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Rifles, Reloading, Optics, Equipment
Reloading
Mandrel /expander
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<blockquote data-quote="bigedp51" data-source="post: 1532109" data-attributes="member: 28965"><p>There is a reason why Redding includes a expander with their bushing dies. That being said the biggest cause of neck runout is if the sizing dies expander is locked down off center.</p><p></p><p>The advantage of using a expander die is the case neck is expanded on the up stroke of the ram with the case resting on its base.</p><p></p><p><span style="font-size: 18px"><strong>Tech Line & Tips (FAQs)</strong></span></p><p><span style="font-size: 18px"><strong><a href="https://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection" target="_blank">Bushing Selection</a></strong></span></p><p><a href="https://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection" target="_blank">https://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection</a></p><p>If the neck wall thickness varies more than 0.002", it may be necessary to use a bushing a couple of thousandths smaller than your calculations indicate, and then use a size button in the die to determine the final inside neck diameter.</p><p></p><p>[MEDIA=youtube]ac3iDJxDgxk[/MEDIA]</p><p></p><p>I prefer Forster full length benchrest resizing dies with their high mounted floating expanders. This is because they produce the least neck runout of any type die I have ever used.</p><p></p><p>But now the shocker, a cheap Lee resizing die has the expander centered in its locking collet. And can produce very little neck runout for the average reloader. And the Lee lock ring with its rubber o-ring allows the die to float and self center in the press.</p><p></p><p><img src="https://i.imgur.com/QC9xK5D.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1532109, member: 28965"] There is a reason why Redding includes a expander with their bushing dies. That being said the biggest cause of neck runout is if the sizing dies expander is locked down off center. The advantage of using a expander die is the case neck is expanded on the up stroke of the ram with the case resting on its base. [SIZE=5][B]Tech Line & Tips (FAQs)[/B] [B][URL='https://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection']Bushing Selection[/URL][/B][/SIZE] [URL]https://www.redding-reloading.com/tech-line-a-tips-faqs/140-bushing-selection[/URL] If the neck wall thickness varies more than 0.002", it may be necessary to use a bushing a couple of thousandths smaller than your calculations indicate, and then use a size button in the die to determine the final inside neck diameter. [MEDIA=youtube]ac3iDJxDgxk[/MEDIA] I prefer Forster full length benchrest resizing dies with their high mounted floating expanders. This is because they produce the least neck runout of any type die I have ever used. But now the shocker, a cheap Lee resizing die has the expander centered in its locking collet. And can produce very little neck runout for the average reloader. And the Lee lock ring with its rubber o-ring allows the die to float and self center in the press. [img]https://i.imgur.com/QC9xK5D.jpg[/img] [/QUOTE]
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Mandrel /expander
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