PDX1 is a great loading, but as said, a little pricey. It is however the same bullet found in Winchester's Ranger Bonded line, and they are alot cheaper with 50 rounds than the 20 round civilian packs.
I have shot a few into water, and one time I didnt make sure that I had enough water jugs, and it ended up going through all three jugs and a piece of 1/2" plywood and the bullet was never recovered... That time... LOL
But I stepped up the jugs and backer, and honestly it looks like a Gold Dot when expanded. Penetration is great and expansion is about average, right around .670" for the 40 S&W 180 gr load. Ranger T-series usually run around .800"+ and Federal HST run around .850"+ but dont penetrate as much as the PDX1 load.