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Rifles, Reloading, Optics, Equipment
Reloading
Belted Magnum Head Spacing
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<blockquote data-quote="woods" data-source="post: 1466155" data-attributes="member: 6042"><p>IMO, no</p><p></p><p>The reason is that the shoulder has not moved all the way to contact with the chamber so the belted case will headspace on the belt when the case moves all the way forward during firing and there will still be a gap between the case shoulder and the chamber shoulder</p><p></p><p>For example I reload for several belted cases and take measurements with the Hornady comparator installed on the calipers</p><p></p><p><img src="https://i.imgur.com/Yks6UNt.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>These measurements are not "headspace" and are useful in comparing the brass movement from one measurement to the other</p><p></p><p>Example of measurements taken on belted magnums</p><p></p><p>264 win mag</p><p>new case - 2.109"</p><p>once fired - 2.136" still gap between case shoulder and chamber shoulder</p><p>twice fired - 2.1385" case fully expanded</p><p></p><p>300 win mag (one of many)</p><p>new case - 2.253"</p><p>once fired - 2.270" not fully expanded</p><p>twice fired - 2.272" almost fully expanded but still no "crush fit" when chambering before sizing</p><p>3 times fired - 2. 2725" full expanded with "crush fit" and case WILL headspace on belt and shoulder</p><p></p><p>338 win mag</p><p>new case - 2.097"</p><p>once fired - 2.120"</p><p>twice fired - 2.123"</p><p>3 times fired - 2.124" crush fit</p><p></p><p>Just some of the examples</p><p></p><p>Now if you had said</p><p></p><p>"Once a new case has been fired, if it's not FL resized (just neck sized) the case that <strong><em><u>has been fired until you have a crush fit</u></em></strong>, will the case head space off the shoulder not the belt?"</p><p></p><p>Then yes</p><p></p><p>IOW it is possible and preferable to headspace a belted magnum off the shoulder after the case is fully expanded and you have a crush fit</p><p></p><p>JMHO</p></blockquote><p></p>
[QUOTE="woods, post: 1466155, member: 6042"] IMO, no The reason is that the shoulder has not moved all the way to contact with the chamber so the belted case will headspace on the belt when the case moves all the way forward during firing and there will still be a gap between the case shoulder and the chamber shoulder For example I reload for several belted cases and take measurements with the Hornady comparator installed on the calipers [img]https://i.imgur.com/Yks6UNt.jpg[/img] These measurements are not "headspace" and are useful in comparing the brass movement from one measurement to the other Example of measurements taken on belted magnums 264 win mag new case - 2.109" once fired - 2.136" still gap between case shoulder and chamber shoulder twice fired - 2.1385" case fully expanded 300 win mag (one of many) new case - 2.253" once fired - 2.270" not fully expanded twice fired - 2.272" almost fully expanded but still no "crush fit" when chambering before sizing 3 times fired - 2. 2725" full expanded with "crush fit" and case WILL headspace on belt and shoulder 338 win mag new case - 2.097" once fired - 2.120" twice fired - 2.123" 3 times fired - 2.124" crush fit Just some of the examples Now if you had said "Once a new case has been fired, if it's not FL resized (just neck sized) the case that [B][I][U]has been fired until you have a crush fit[/U][/I][/B], will the case head space off the shoulder not the belt?" Then yes IOW it is possible and preferable to headspace a belted magnum off the shoulder after the case is fully expanded and you have a crush fit JMHO [/QUOTE]
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Belted Magnum Head Spacing
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