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Rifles, Reloading, Optics, Equipment
Reloading
Unfired ADG brass - Headspace question
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<blockquote data-quote="J E Custom" data-source="post: 1668657" data-attributes="member: 2736"><p>If you measure from the datum line to the case head the dimension should be 2.270 to 2.263.</p><p></p><p>The belt dimension should be .220 to .210.</p><p></p><p>Subtract the .220- from the 2.270- and that is the SAMMI case length.</p><p></p><p>Belted cases always have minimum case size/length to fit any chamber the belt to case head is the important dimension on new cases. head space is measured from the front of the belt to the bolt face and should be .220 to .223 with a go gauge. Example: if your belt face to case head is .218 and your chamber head space is .002 you will have almost .004 thousandths head space in the chamber.</p><p></p><p>I recommend using a go gauge to find the actual head space of the chamber and after fire forming, size only enough to close the bolt easy. </p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1668657, member: 2736"] If you measure from the datum line to the case head the dimension should be 2.270 to 2.263. The belt dimension should be .220 to .210. Subtract the .220- from the 2.270- and that is the SAMMI case length. Belted cases always have minimum case size/length to fit any chamber the belt to case head is the important dimension on new cases. head space is measured from the front of the belt to the bolt face and should be .220 to .223 with a go gauge. Example: if your belt face to case head is .218 and your chamber head space is .002 you will have almost .004 thousandths head space in the chamber. I recommend using a go gauge to find the actual head space of the chamber and after fire forming, size only enough to close the bolt easy. J E CUSTOM [/QUOTE]
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Unfired ADG brass - Headspace question
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