This is Drew's first picture
I doubt there is a bulge in those barrels.
I interpret what I see as the tear started back by the powder charge and peeled forward toward the muzzle. The expansion evident toward the muzzled end of the tear is from the metal being bent back as the piece went forward. In Drew's picture that I posted above I do not see a bulge on the bottom of the barrel compared to the watertable.
The imprint of the extractor on the steel base, the lack of a bulge (in my opinion), and the primer sitting high indicate overpressure.
I have had some erratic results from my 9000 when some trash got caught up in the drop tube. The trash was most likely in an empty cartridge fired on a hunt and then dropped into my gamebag with the dead bird, the muddy dog boot that came off, and the miscellaneous twigs and leaves that fell in as I pushed through the brush.
