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Rifles, Reloading, Optics, Equipment
Gunsmithing
How to accurately measure (not validate) headspace?
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<blockquote data-quote="Jeffpatton00" data-source="post: 1852400" data-attributes="member: 97649"><p>As the OP, I'll jump back in here. If people are mis-using the term "headspace", let's define it so we're all on the same page. My understanding is that headspace is the distance between the bolt face and the datum line in the chamber's shoulder. A bolt-action rifle's preferred headspace is the length of the case when pressed all the way forward against the chamber's shoulder, plus the distance from the base of the case to the bolt face, generally 0.002" - 0.003". Do we agree on that? </p><p></p><p>Some have proposed putting shims or tape behind the case until the bolt becomes harder to close, other have suggested closing the bolt on a protruding spent primer, and the cam action of closing the bolt would press the primer into the pocket, and the remaining OAL (from the case shoulder's datum line to the back of the primer) is the total headspace. Do we agree on this?</p><p></p><p>If any of this is incorrect, please jump in, I want to make sure I understand the geometry.</p></blockquote><p></p>
[QUOTE="Jeffpatton00, post: 1852400, member: 97649"] As the OP, I'll jump back in here. If people are mis-using the term "headspace", let's define it so we're all on the same page. My understanding is that headspace is the distance between the bolt face and the datum line in the chamber's shoulder. A bolt-action rifle's preferred headspace is the length of the case when pressed all the way forward against the chamber's shoulder, plus the distance from the base of the case to the bolt face, generally 0.002" - 0.003". Do we agree on that? Some have proposed putting shims or tape behind the case until the bolt becomes harder to close, other have suggested closing the bolt on a protruding spent primer, and the cam action of closing the bolt would press the primer into the pocket, and the remaining OAL (from the case shoulder's datum line to the back of the primer) is the total headspace. Do we agree on this? If any of this is incorrect, please jump in, I want to make sure I understand the geometry. [/QUOTE]
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Gunsmithing
How to accurately measure (not validate) headspace?
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