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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: 1387046" data-attributes="member: 28965"><p><span style="font-size: 15px"><span style="font-size: 15px">twadsw01</span></span></p><p><span style="font-size: 15px"><span style="font-size: 15px"></span></span></p><p>What make and type dies are you using? Dillon dies are small base dies and reduce case diameter even more than standard dies.</p><p></p><p>When you full length resize it is possible to make the case longer in cartridge headspace length than its fired length. This is because the case is squeezed inward and the brass can only move upward in the die.JP Enterprise</p><p></p><p>You just need to measure a few fired cases from your chamber and then adjust the die to bump the shoulder back .003 to .006 for a semi-auto.</p><p></p><p>Below a Colt Field gauge at1.4736</p><p><img src="https://i.imgur.com/MLSZTeH.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below the same Colt gauge in my adjusted Hornady cartridge case headspace gauge.</p><p><img src="https://i.imgur.com/kkoU6og.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below a "fired" Lake City 5.56 case fired in my AR15, and I bump the shoulder back .003 shorter from this measurement.</p><p><img src="https://i.imgur.com/OJqNmQH.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below are a Wilson, Dillon and JP Enterprise case gauges and not all case gauges have the same inside diameter. The JP Enterprise gauge inside diameter is smaller the the Wilson and Dillon gauges and is made with a chamber finish reamer. A case fired in a semi-auto should be .003 to .005 smaller in diameter than its fired diameter after sizing. This is to insure the case will spring back from the chamber walls and eject reliably.</p><p></p><p>I use the red JP Enterprise case gauge to check all my loaded rounds to ensure my reloads will fit in the three AR15 rifles I load for. Meaning I use the Hornady gauge for die adjustment and double check the loaded cartridge in a case gauge for diameter and headspace length.</p><p></p><p><img src="https://i.imgur.com/KSB3ZvP.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p> All you need to do is bump the case shoulder back .003 to .006 from its fired length. And this depends on your die adjustment and how much brass spring back you have after sizing. And a case gauge checks to ensure the resized case is within acceptable shoulder location to chamber.</p><p></p><p>Bottom line check some factory loaded ammunition with your Hornady gauge against your resized cases. My resized cases are .002 longer than factory loaded Federal M193 with .003 head clearance.</p></blockquote><p></p>
[QUOTE="bigedp51, post: 1387046, member: 28965"] [SIZE=4][SIZE=4]twadsw01 [/SIZE][/SIZE] What make and type dies are you using? Dillon dies are small base dies and reduce case diameter even more than standard dies. When you full length resize it is possible to make the case longer in cartridge headspace length than its fired length. This is because the case is squeezed inward and the brass can only move upward in the die.JP Enterprise You just need to measure a few fired cases from your chamber and then adjust the die to bump the shoulder back .003 to .006 for a semi-auto. Below a Colt Field gauge at1.4736 [IMG]https://i.imgur.com/MLSZTeH.jpg[/IMG] Below the same Colt gauge in my adjusted Hornady cartridge case headspace gauge. [IMG]https://i.imgur.com/kkoU6og.jpg[/IMG] Below a "fired" Lake City 5.56 case fired in my AR15, and I bump the shoulder back .003 shorter from this measurement. [IMG]https://i.imgur.com/OJqNmQH.jpg[/IMG] Below are a Wilson, Dillon and JP Enterprise case gauges and not all case gauges have the same inside diameter. The JP Enterprise gauge inside diameter is smaller the the Wilson and Dillon gauges and is made with a chamber finish reamer. A case fired in a semi-auto should be .003 to .005 smaller in diameter than its fired diameter after sizing. This is to insure the case will spring back from the chamber walls and eject reliably. I use the red JP Enterprise case gauge to check all my loaded rounds to ensure my reloads will fit in the three AR15 rifles I load for. Meaning I use the Hornady gauge for die adjustment and double check the loaded cartridge in a case gauge for diameter and headspace length. [IMG]https://i.imgur.com/KSB3ZvP.jpg[/IMG] All you need to do is bump the case shoulder back .003 to .006 from its fired length. And this depends on your die adjustment and how much brass spring back you have after sizing. And a case gauge checks to ensure the resized case is within acceptable shoulder location to chamber. Bottom line check some factory loaded ammunition with your Hornady gauge against your resized cases. My resized cases are .002 longer than factory loaded Federal M193 with .003 head clearance. [/QUOTE]
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Nonsensical Headspace Measurements on 223rem cases...??
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