Was he the one that developed (forgive my memory here...) "Pin Grabbers"? They looked like a JHP with a jagged, sawtooth edge around the outside top edge. IIRC, they were originally developed to "bite" in bowling pins during the pin shooting games, but Cirillo opined that they would make good SD rounds because they would not (in theory?) bounce off of a skull.
Then again, my memory might be decieving me and I could be wrong. There was one time I was wrong, but I was mistaken . . .