Stubborn extractor screw

The original posts stated that the case came apart. Not separated,  apart. So the inertia was there in the form of a sine wave, starting in the chamber working backwards with the only damper being the bolt assembly first and then the lug recesses in the reciever.

For reference only: Your average stripped and used No4 bolt body is approximately 5.555" long. The one that I ruined measures in @ 5.415". The fact remains that, the damage is there, will always be there, and will not go away by simply wishing it away or swapping out parts. Your 8800 Piezo number is only correct to a degree as well.  There is also the amplification of the pressure wave as it is moving. Taking into consideration the actual square inches of surface the bolt body has and using the original oiled proof test numbers, the face of that bolt head was hit, although briefly with over 25 tons of highly forced pressure. No different than a hydraulic ram. Knowing there is a difference between tonnage in pressure and actual weight. The numbers are still there regardless. Like the difference between a ton of bricks and a ton of air. It all adds up to the same number, 1 ton. 

& with that consensus of educated opinion I'm gong to put this thread to bed.

Apologies to the O.P. but there may be those less experienced who will be reading this & I'd hate to think we as a group, even inadvertently set some newbie off on a road knowing there's a "dead mans curve" waiting just around the corner.

I'm not going to delete it because there's a lot of good information & it is if nothing else serving as a cautionary tale to others about overloads. & reading bold clues of impending failure of an action.