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Rifles, Reloading, Optics, Equipment
Reloading
Nonsensical Headspace Measurements on 223rem cases...??
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<blockquote data-quote="bigedp51" data-source="post: 1387195" data-attributes="member: 28965"><p>Because a case grows when full length resized <strong>(Newton's third law)</strong> and then the case shoulder is pushed back down by the shoulder of the die. This is why resizing dies have threads so the die can be adjusted up and down for the correct amount of shoulder bump.</p><p></p><p>And below you want the case shoulder .003 to .006 below the red dotted line after full length resizing on a semi-auto.</p><p></p><p><img src="https://i.imgur.com/wm05ArY.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>And if the case is shorter after bullet seating, it could be seating force or the crimp making it shorter. </p><p>(it that third law thing again)</p><p></p><p>Try lubing the inside of the case neck with powdered graphite to ease seating force. And crimp in a separate operation and see which step is making the case shorter.</p><p></p><p>So stop over thinking and over engineering a simple sizing operation.</p><p></p><p><img src="http://www.efdalozer.com/wp-content/uploads/2017/10/eins.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1387195, member: 28965"] Because a case grows when full length resized [B](Newton's third law)[/B] and then the case shoulder is pushed back down by the shoulder of the die. This is why resizing dies have threads so the die can be adjusted up and down for the correct amount of shoulder bump. And below you want the case shoulder .003 to .006 below the red dotted line after full length resizing on a semi-auto. [IMG]https://i.imgur.com/wm05ArY.gif[/IMG] And if the case is shorter after bullet seating, it could be seating force or the crimp making it shorter. (it that third law thing again) Try lubing the inside of the case neck with powdered graphite to ease seating force. And crimp in a separate operation and see which step is making the case shorter. So stop over thinking and over engineering a simple sizing operation. [img]http://www.efdalozer.com/wp-content/uploads/2017/10/eins.jpg[/img] [/QUOTE]
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Nonsensical Headspace Measurements on 223rem cases...??
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