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Bart B. · February 14, 2013, 08:14 AM

wyobohunter, exactly what does it depend on? You may have a good point of view and many would benefit from knowing what it is. You jumped into this conversation and that's fine by me, so you're not staying out of it.

F. Guffey, you mention that there is chamber length and case length (from the head of the case to the shoulder/datum). Chamber length typically refers to the distance from the breech face to chamber mouth; it's 2.025" for the .308. Case length's the distance from case head to case mouth; SAAMI specs show that at 2.015" -.020". Chamber "headspace" (as well as case headspace) is what the ammo industry and reloaders refer to as the head-to-datum length; one for the chamber and another for the case. I think you're getting length and headspace terms mixed up.

February 14, 2013, 08:14 AM	#23
Bart B. Senior Member Join Date: February 15, 2009 Posts: 8,927	wyobohunter, exactly what does it depend on? You may have a good point of view and many would benefit from knowing what it is. You jumped into this conversation and that's fine by me, so you're not staying out of it. F. Guffey, you mention that there is chamber length and case length (from the head of the case to the shoulder/datum). Chamber length typically refers to the distance from the breech face to chamber mouth; it's 2.025" for the .308. Case length's the distance from case head to case mouth; SAAMI specs show that at 2.015" -.020". Chamber "headspace" (as well as case headspace) is what the ammo industry and reloaders refer to as the head-to-datum length; one for the chamber and another for the case. I think you're getting length and headspace terms mixed up. Last edited by Bart B.; February 14, 2013 at 09:32 AM.