Believe what you wish guys that is fantasy. There is nothing you could ever do to create that effect. That picture has been floating around the net for several months now. I have seen many barrels damaged from a blockage and that will never happen. Gunworks had a full display case of barrels that had a blockage and not a single one was even close to that. Myth Busters even did an episode on the very same myth and they were unable to ever duplicate that.
It's a hoax and just for the record there is a reason photo shop comes free with windows there is much better software out there. [wink]