Well, Slamfire, you should recognize one when you see the results. That is a pretty classic example of what happens in a true slamfire (firing out of battery). I doubt the age of the ammunition had anything to do with it.
Bolt damage, cracked receiver ring, is consistent with a high pressure event with the bolt in battery. The fact the receiver heel is still on the rifle, (remember that slamfire thread?) http://thefiringline.com/forums/show...arand+slamfire
shows the bolt did not cycle out of battery.
Maybe you can tell me why does not the age of ammunition matter?, what about previous storage conditions, do they matter either?