Thread resurrection.
In my Glocks the 115gr. +P+ Penetrators run great with zero issues.
In my Wilson Commander 9mm the Penetrators spit the primers out almost as far as the empty casings go.
Out of 11 rounds shot, 9 of them blew out the primers.
I'm guessing a tighter chamber and/or shorter lead is squeezing every last PSI out of them to the point of over pressure.
I'll save the +P+ Underwood for my Glocks, blowing primers 90% of the time isn't worth messing around with.