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Rifles, Reloading, Optics, Equipment
Reloading
How to measure shoulder bump without rcbs precision mic?
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<blockquote data-quote="bigedp51" data-source="post: 1897720" data-attributes="member: 28965"><p>If you measure a "fired" case with the Hornady gauge and adjust the die for the proper amount of bump there is "NO" feel. The amount of shoulder bump is how much head clearance you have and the bolt face does not touch the rear of the case. Meaning the Hornady type gauges eliminated the need for "feel" closing the bolt.</p><p></p><p>The ejector and firing pin push the case forward leaving the head clearance or air space between the bolt face and the rear of the case. Meaning you can not "feel" the head clearance or air space.</p><p></p><p>"FEEL" was what was used before the Hornady type gauges came into being. And the Hornady gauge is far more accurate than guessing by what you "feel". And all you need to remember is there is some brass spring back on a once fired case. Meaning the shoulder of the case is shorter than actual chamber headspace. The basic thumb rule for shoulder bump is .001 to .002 for a bolt action and .003 to .006 for a semi-auto.</p><p></p><p><img src="https://i.imgur.com/HK76WCp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1897720, member: 28965"] If you measure a "fired" case with the Hornady gauge and adjust the die for the proper amount of bump there is "NO" feel. The amount of shoulder bump is how much head clearance you have and the bolt face does not touch the rear of the case. Meaning the Hornady type gauges eliminated the need for "feel" closing the bolt. The ejector and firing pin push the case forward leaving the head clearance or air space between the bolt face and the rear of the case. Meaning you can not "feel" the head clearance or air space. "FEEL" was what was used before the Hornady type gauges came into being. And the Hornady gauge is far more accurate than guessing by what you "feel". And all you need to remember is there is some brass spring back on a once fired case. Meaning the shoulder of the case is shorter than actual chamber headspace. The basic thumb rule for shoulder bump is .001 to .002 for a bolt action and .003 to .006 for a semi-auto. [IMG]https://i.imgur.com/HK76WCp.jpg[/IMG] [/QUOTE]
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How to measure shoulder bump without rcbs precision mic?
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