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This is getting very complex Mr.Guffey
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If the case is FL sized to a length less than the distance from the bolt when closed too the chamber shoulder or is it datum? "In a 308" The case is expanded do to the pressure of the powder charge in all directions. It's stretched out to the chamber walls, back to the bolt face and forward to the chamber shoulder that acts as a gas check and the neck to the chamber neck walls. So if you resize the case to a shorter length. It will stretch to a longer length. That is what causes (Metal God) to give us a fine picture for reference.
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In that case we get stretching along with thinning of the case as metal god shows in his picture.
The stretching of the cases from metal god's picture are from excess head space I believe. What happens is the head stays against the bolt face and the shoulder of the case is driven to the shoulder of the chamber when the cartridge is fired. If the gap is more than 0.002-3K That's where the case will stretch and if continues case will separate. That's where you want to just bump the shoulder 0.002-3K when Full Length sizing.
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The first time around you start with "What happens"' the case head is against the bolt face and the shoulder moves, the case is driven forward. I have said many times if the case head is against the bolt face and the shoulder 'MOVES
forward and then there is nothing after that because that is not what happens.
I said I chambered a round in a rifle and pulled the trigger, after pulling the trigger I said the shoulder did not move even thought the shoulder of the case was .127" from the shoulder of the chamber... According to reloaders a case will not stretch .127" without case head separation. Reloaders everywhere say head space is the cause of case head separation and then I said there has to be something about the sequence of events between pulling the trigger and the bullet leaving the barrel reloaders do not understand.
I took the time to paste your quotes from two different responses, the two quotes are different. My opinion; ever reloaders on this forum should have noticed.
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It took me many years to eventually understand it all. That is if I do.
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Longshot4, have MG explain it to you. You said the shoulder moved, I ask "How is that possible?", I ask because you said the case head was against the bolt face.
Case head separation: I have managed to destroy cases in a 30/40 Crag, the rifle was part of an inheritance. After testing the rifle I had the new owner promised me he would not fire the rifle. A smith in Colorado sent me a receiver; problem, replacing the receiver on a rifle your grandfather left you would not be the same rifle.
F. Guffey