Looks like a .40 that was fired in a .45
heh, I'd go with that last... appears to be overload expansion into a cylinder that is oversize for the round. The obviously unsupported pressure transient caused failure along the weakest elements in the shell. that must have looked like something coming out the barrel...
A .40 loaded in a .45 chamber, how does this happen? Was it fed through the clip, or was a single round dropped in the chamber manually?
The gun was checked out and there was zero impact on the firearm, the gentleman went on to shoot the match and did very well.Wonder what the inside of the barrel looks like.