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Old March 4, 2013, 12:44 AM   #23
F. Guffey
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Join Date: July 18, 2008
Posts: 2,796
“Measured from, measured from the datum, the length of the case is measured from the datum/shoulder to the head of the case”

Not complicated, head space is measured from the datum to the bolt face, I know, I said length of the case, then there is SAAMI, SAAMI says etc.. SAMMI does not list head space for the case, SAAMI list head space for the chamber from the datum to the bolt face. Back to not complicated, I off set the length of the chamber from the shoulder/datum to the bolt face with the length of the case from the shoulder/datum to the head of the case.

F. Guffey
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