I got new carry ammo on sunday and did a little informal test. Left to right, 180 gr. Federal FMJ, 180 gr. Winchester 'white box usa' JHP, and 180 gr. Winchester PDX1 Bonded JHP. All .40 S&W, the white box round was shot into jugs of water, the others into stacked phonebooks. The first phonebook shot with the PDX1's had enterance holes the size of FMJ's, and exit holes the size of quarters. All of them expanded into dry phonebooks. I shot several white box hollows into dry phonebooks and 99% of them got clogged with paper and did not expand at all.
Needless to say, I seriously doubt I will ever carry anything other than PDX1. I had high hopes for it after reading several articles about it passing the strict FBI protocols and them now carrying it and I was very impressed.