Thread: Headspace
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Old December 29, 2018, 09:28 AM   #7
Nathan
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Join Date: July 1, 2001
Posts: 4,665
But when the rifle is fired, the ejector and or the firing pin push the case into the chamber as far as it will go. Where it stops directly affects reliability. This was a big issue before precision machining. The amount of headspace and firing pin protrusion directly impact how solidly the primer is whacked when shooting.

Therefore, firing pin protrusion, headspace and primer seating are all critical dimensions in the modern rifle.

As a reloader, headspace becomes a control point on the case side. Controlling the datum to case head measurement as well as primer seating is critical to accuracy and reliability.
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