I would love to know where that shot went when the case ruptured. My bet is that it hit low somewhere. I feel the rupture may have caused some of the gases to move forward to the shoulder area of the chamber where they were sealed off by the casing itself, causing the dents in the casing at that point. The argument to this may be that the vent ot the side of the receiver should have handled the gases from the ruptured casing. That's a thought, anyhow............what do you all think??