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Rifles, Reloading, Optics, Equipment
Reloading
Headspace and case stretch
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<blockquote data-quote="bigedp51" data-source="post: 1634580" data-attributes="member: 28965"><p>You do not need to load a live primer and fire it in your rifle. You use a fired spent primer as I stated in my posting and let the bolt face seat the primer. And the amount the primer is protruding will be your head clearance or the air space between the rear of the case and the bolt face. And this will be how far the case can stretch when fired.</p><p></p><p>Below is checking head clearance and headspace on a 30-30 Winchester. And if you add the rim thickness to the primer protrusion you will have the rifles actual headspace.</p><p></p><p>So again the shoulder location on a new unfired rimmed or belted case means nothing. And what does matter is the amount of head clearance you have and if special fire forming methods are needed.</p><p></p><p><img src="https://i.imgur.com/k8Yypdz.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below on the far left is a new unfired .303 British and its shoulder is approximately a 1/4 inch shorter than the fired case in the center. The case on the far right was full length resized with maximum shoulder setback and failed after the 3rd firing. Meaning the case was fired three times with .009 head clearance and stretched beyond its elastic limits. This is why you only bump the shoulder back .001 or .002 and keep the case from stretching in the base web area.</p><p></p><p><img src="https://i.imgur.com/NHlR9jO.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1634580, member: 28965"] You do not need to load a live primer and fire it in your rifle. You use a fired spent primer as I stated in my posting and let the bolt face seat the primer. And the amount the primer is protruding will be your head clearance or the air space between the rear of the case and the bolt face. And this will be how far the case can stretch when fired. Below is checking head clearance and headspace on a 30-30 Winchester. And if you add the rim thickness to the primer protrusion you will have the rifles actual headspace. So again the shoulder location on a new unfired rimmed or belted case means nothing. And what does matter is the amount of head clearance you have and if special fire forming methods are needed. [IMG]https://i.imgur.com/k8Yypdz.gif[/IMG] Below on the far left is a new unfired .303 British and its shoulder is approximately a 1/4 inch shorter than the fired case in the center. The case on the far right was full length resized with maximum shoulder setback and failed after the 3rd firing. Meaning the case was fired three times with .009 head clearance and stretched beyond its elastic limits. This is why you only bump the shoulder back .001 or .002 and keep the case from stretching in the base web area. [img]https://i.imgur.com/NHlR9jO.jpg[/img] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Headspace and case stretch
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