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Rifles, Reloading, Optics, Equipment
Gunsmithing
How to accurately measure (not validate) headspace?
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<blockquote data-quote="MNbogboy" data-source="post: 1850578" data-attributes="member: 18849"><p>CBTO is a measurement of cartridge base to where the ogive of the bullet meets the lands.</p><p>Where case headspace is the measurement from the bolt face to the shoulder in the chamber.</p><p>Both are unique to the rifle but unrelated to each other. For example throat erosion will have no effect on case headspace (exception straight walled cases).</p><p>If you have a Remington (or clone) style bolt you can use the "Wheeler method" to find both measurements. In a Savage the same method can be applied if the rear baffle is disassembled.</p><p>To find actual case headspace you can also use a "go" gauge with shims and then measure them together with a case comparator. I believe several on here use this method.</p><p></p><p>Hope JE logs into this one, his advice as well as quite a few others is very sound.</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1850578, member: 18849"] CBTO is a measurement of cartridge base to where the ogive of the bullet meets the lands. Where case headspace is the measurement from the bolt face to the shoulder in the chamber. Both are unique to the rifle but unrelated to each other. For example throat erosion will have no effect on case headspace (exception straight walled cases). If you have a Remington (or clone) style bolt you can use the "Wheeler method" to find both measurements. In a Savage the same method can be applied if the rear baffle is disassembled. To find actual case headspace you can also use a "go" gauge with shims and then measure them together with a case comparator. I believe several on here use this method. Hope JE logs into this one, his advice as well as quite a few others is very sound. [/QUOTE]
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How to accurately measure (not validate) headspace?
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