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Rifles, Reloading, Optics, Equipment
Gunsmithing
How to accurately measure (not validate) headspace?
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<blockquote data-quote="fguffey" data-source="post: 1854172" data-attributes="member: 113511"><p>I can check the length of a chamber from the datum to the bolt face 3 different ways without a head space gage. The easiest chamber to check is the chamber in the 03/03A3. I am more interested in offsetting the length of the chamber from the datum to the bolt face with the length of the case from the datum to the case head. </p><p></p><p>It is claimed I have rifles with excessive head space. For example one of my M1917s chamber is .002" longer than a field reject length gage. That puts the minimum length/full length sized case .016" too short from the shoulder of the chamber to the bolt face. I do not see this as a problem, I form 280 Remington cases to 30/06 cases by adding .014" to the length of the case when forming. Adding .014" to the length of the case from the datum to the case head leaves me a 30/06 case that has .002" clearance between the case head and bolt face (or .002" clearance between the shoulder of the case and shoulder of the chamber). I say that because the fired case proves the shoulder of the case was not against the shoulder of the chamber when fired.</p><p>And then there is the problem with finding a reloader or smith that understands what happens when I fire minimum length/full length sized cases (factory/store bought) ammo in the long chamber.</p><p></p><p>JeffPatton, I can work with you off line, you could be in the neighbor or we could work by phome.</p><p></p><p>F. Guffey</p></blockquote><p></p>
[QUOTE="fguffey, post: 1854172, member: 113511"] I can check the length of a chamber from the datum to the bolt face 3 different ways without a head space gage. The easiest chamber to check is the chamber in the 03/03A3. I am more interested in offsetting the length of the chamber from the datum to the bolt face with the length of the case from the datum to the case head. It is claimed I have rifles with excessive head space. For example one of my M1917s chamber is .002" longer than a field reject length gage. That puts the minimum length/full length sized case .016" too short from the shoulder of the chamber to the bolt face. I do not see this as a problem, I form 280 Remington cases to 30/06 cases by adding .014" to the length of the case when forming. Adding .014" to the length of the case from the datum to the case head leaves me a 30/06 case that has .002" clearance between the case head and bolt face (or .002" clearance between the shoulder of the case and shoulder of the chamber). I say that because the fired case proves the shoulder of the case was not against the shoulder of the chamber when fired. And then there is the problem with finding a reloader or smith that understands what happens when I fire minimum length/full length sized cases (factory/store bought) ammo in the long chamber. JeffPatton, I can work with you off line, you could be in the neighbor or we could work by phome. F. Guffey [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Gunsmithing
How to accurately measure (not validate) headspace?
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