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Rifles, Reloading, Optics, Equipment
Reloading
308 neck sizing
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<blockquote data-quote="bigedp51" data-source="post: 1891799" data-attributes="member: 28965"><p>This happens with many type dies and I'm not sure exactly why this happens.</p><p></p><p>But a taper crimp die will close up the case mouth and cure the problem.</p><p></p><p>Many reloaders use a Lyman type "M" expander die that aids in straight inline seating. And a taper crimp die will close up the case mouth. The RCBS AR Series .308 and .223 dies come with a taper crimp die.</p><p></p><p>Below are pistol cases showing how straight the bullet is when using a type "M" expander. And the case on the left shows a tilted bullet. And if the seater plug is not a perfect fit on the bullet you will induce bullet runout.</p><p></p><p><img src="https://i.imgur.com/vwgkeH3.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below just bumping the case mouth onto the step allows the bullet to start straight into the case. And if this causes feeding problems the taper crimp die will streamline the case mouth.</p><p></p><p><img src="https://i.imgur.com/ohIUcpd.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Bottom line, I intentionally flare my case mouths on some of my cases and close them with a taper crimp.</p><p></p><p>Remove your Lee dies expander and size a case and see if the case mouth is flared. If not you can just use a expander die to bring the necks back up to the proper diameter.</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1891799, member: 28965"] This happens with many type dies and I'm not sure exactly why this happens. But a taper crimp die will close up the case mouth and cure the problem. Many reloaders use a Lyman type "M" expander die that aids in straight inline seating. And a taper crimp die will close up the case mouth. The RCBS AR Series .308 and .223 dies come with a taper crimp die. Below are pistol cases showing how straight the bullet is when using a type "M" expander. And the case on the left shows a tilted bullet. And if the seater plug is not a perfect fit on the bullet you will induce bullet runout. [IMG]https://i.imgur.com/vwgkeH3.jpg[/IMG] Below just bumping the case mouth onto the step allows the bullet to start straight into the case. And if this causes feeding problems the taper crimp die will streamline the case mouth. [IMG]https://i.imgur.com/ohIUcpd.png[/IMG] Bottom line, I intentionally flare my case mouths on some of my cases and close them with a taper crimp. Remove your Lee dies expander and size a case and see if the case mouth is flared. If not you can just use a expander die to bring the necks back up to the proper diameter. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
308 neck sizing
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