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Bart B. · May 22, 2012, 08:13 AM

If that new ammo has case headspace measuring from 1.623 to 1.64 prior to firing checked with a Hornady headspace comparator gauge, I suspect it's bad ammo. That's assuming you measured correctly. SAAMI specs for .308 Win. case headspace is from 1.627" to 1.634" which is a 7 thousandths inch spread. Your measurements have a 17 thousandths spread.

I, too, wonder how you chambered one with 1.640" case headspace in a chamber that's supposed to be no longer in headspace than 1.634".

May 22, 2012, 08:13 AM	#7
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	If that new ammo has case headspace measuring from 1.623 to 1.64 prior to firing checked with a Hornady headspace comparator gauge, I suspect it's bad ammo. That's assuming you measured correctly. SAAMI specs for .308 Win. case headspace is from 1.627" to 1.634" which is a 7 thousandths inch spread. Your measurements have a 17 thousandths spread. I, too, wonder how you chambered one with 1.640" case headspace in a chamber that's supposed to be no longer in headspace than 1.634".