http://www.saami.org/PubResources/CC...Winchester.pdf
“Good question . If semi your going to want a tad more head space”
SAAMI does not list head space with, on or near the case, SAAMI list the case with a length from the shoulder to the head of the case. Meaning? It is possible to have a case length longer and or shorter, it is not possible to change ‘head space; because the head space is fixed in the chamber. I off set the length of the chamber with the length of the case. My presses and dies have threads. I measure before firing, after firing and again after sizing.
F. Guffey