Quote:
It sure looks like a bulge to me, has from the beginning. Realize also an obstruction this close the the chamber is going to react a bit different than one down at mid barrel. Velocity of the charge is not very high yet so the "Check" is not near so great. While pressure would likely still be greatest at the point of the obstruction, it is also likely that pressure would have increased in the entire chamber up until relieved by the burst. I think you need to try & figure out just what was in that barrel & Why & How it got there. I do not believe that either the gun, nor the load being used, was responsible for this burst.


+1