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Rifles, Reloading, Optics, Equipment
Gunsmithing
How to accurately measure (not validate) headspace?
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<blockquote data-quote="25WSM" data-source="post: 1850904" data-attributes="member: 38048"><p>You really don't need to know the exact measurement. If the go closes and the no-go doesn't it's within spec. The difference between most guages is .003. For resizing your cases use a comparitor on your fired case and set your die to shorten it by . 002 to . 003 and your brass should fit proper. I prefer .003 that way if some of them spring back more than others there is still clearence in the chamber. If some brass code easy and some have resistance you will get verticle in your groups. When you get throat erosion and need to chase the lands this measurement does not change. Your seating depth will change but not your sized case length. Hope this helps you. </p><p>Shep</p></blockquote><p></p>
[QUOTE="25WSM, post: 1850904, member: 38048"] You really don't need to know the exact measurement. If the go closes and the no-go doesn't it's within spec. The difference between most guages is .003. For resizing your cases use a comparitor on your fired case and set your die to shorten it by . 002 to . 003 and your brass should fit proper. I prefer .003 that way if some of them spring back more than others there is still clearence in the chamber. If some brass code easy and some have resistance you will get verticle in your groups. When you get throat erosion and need to chase the lands this measurement does not change. Your seating depth will change but not your sized case length. Hope this helps you. Shep [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
How to accurately measure (not validate) headspace?
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