Thanks to John C. for sending us this our way via Facebook.
This was from a Sig MPX that I had been shooting suppressed. I had been using white lithium grease in the can and the back pressure had forced that back into the barrel. After removing the suppressor and firing a shot from about 4 inches away it printed this. Lets be honest it was a ‘line of sight line of bore’ error. One can actually count the 6 groves as the grease spun off the bullet at 100,000 rpm. Thought this may make a good post. You are welcome to use it.