...He measured the far edge of the burst and it
recorded .090" and the back as I indicated was .112"...
I measured 11 sets of damascus barrels last night. I measured them 1" from the end of the barrel. The thinnest measured .178, the thickest measured .301. Most were around .28. They included Lefever, Ithaca, Aubrey, Remington and some unknown barrels sets I have. They were laminate / twist and damascus up to 3 iron. I do not have a set of Baker tubes to measure.
I am not saying the wall thickness caused the rupture, nor that it ruptured because it was damascus. In this case, the damascus may have prevented a more serious injury. A split fluid barrel at that point would run down the barrel for a ways, almost certainly causing injury.
Pete