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Rifles, Reloading, Optics, Equipment
Reloading
.223 AR Reloading Shoulder Setback
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<blockquote data-quote="bigedp51" data-source="post: 1496813" data-attributes="member: 28965"><p>On a bolt action it is .001 to .002 shoulder bump.</p><p>For a semi-auto it is .003 to .006 shoulder bump.</p><p></p><p>The case body should be .003 to .005 smaller in diameter than its fired diameter. This allow the case body to spring back from the chamber walls and extract reliably.</p><p></p><p>I only use a small base die when I buy bulk once fired Lake City or range pickup LC brass the first time I size the case. Thereafter I use a standard die, "BUT" chambers and dies vary in size so you should measure the case body diameter before and after sizing. Example, I have a standard Lee .223 full length die that sizes the case more than my RCBS small base die. Meaning smaller in diameter and the amount of shoulder bump with the die adjusted higher.</p><p></p><p><img src="https://i.imgur.com/gFCObJR.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1496813, member: 28965"] On a bolt action it is .001 to .002 shoulder bump. For a semi-auto it is .003 to .006 shoulder bump. The case body should be .003 to .005 smaller in diameter than its fired diameter. This allow the case body to spring back from the chamber walls and extract reliably. I only use a small base die when I buy bulk once fired Lake City or range pickup LC brass the first time I size the case. Thereafter I use a standard die, "BUT" chambers and dies vary in size so you should measure the case body diameter before and after sizing. Example, I have a standard Lee .223 full length die that sizes the case more than my RCBS small base die. Meaning smaller in diameter and the amount of shoulder bump with the die adjusted higher. [IMG]https://i.imgur.com/gFCObJR.png[/IMG] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
.223 AR Reloading Shoulder Setback
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