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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: 1852768" data-attributes="member: 18849"><p>Edd is 100% correct in the above post. The saami number will never match your comparator number. </p><p>Each chamber in each individual rifle will have its own baseline when creating brass and loaded ammunition.</p><p>Also actual chamber headspace has no relationship to seating distance. Seating distance to the lands is generated from a measurement from bolt face to the lands themselves. Case headspace (chamber headspace + case clearance to bolt face) will affect seating distance if not controlled in sizing operations.</p><p>Sometimes seating distances as small as .002 or .003 can be noticed in precision loading. Therefore case headspace is an important control in achieving consistent distance of bullet ogive to the lands.</p><p></p><p>Makes a person think that not many use Saami numbers or "actual" chamber headspace numbers when developing precision ammunition.</p><p>We need to know how long our brass should be from base to shoulder and how deep to seat our bullets measured from base to ogive.</p></blockquote><p></p>
[QUOTE="MNbogboy, post: 1852768, member: 18849"] Edd is 100% correct in the above post. The saami number will never match your comparator number. Each chamber in each individual rifle will have its own baseline when creating brass and loaded ammunition. Also actual chamber headspace has no relationship to seating distance. Seating distance to the lands is generated from a measurement from bolt face to the lands themselves. Case headspace (chamber headspace + case clearance to bolt face) will affect seating distance if not controlled in sizing operations. Sometimes seating distances as small as .002 or .003 can be noticed in precision loading. Therefore case headspace is an important control in achieving consistent distance of bullet ogive to the lands. Makes a person think that not many use Saami numbers or "actual" chamber headspace numbers when developing precision ammunition. We need to know how long our brass should be from base to shoulder and how deep to seat our bullets measured from base to ogive. [/QUOTE]
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How to accurately measure (not validate) headspace?
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