Mag,
What did you test them in? Back when testing my Rowland, I could get the 230 and 250 (standard) xtp's to mushroom pretty well (typical) in damp/wet newsprint. The 230's bordered on inside out. The chemically bonded bullets were not readily available back then.
I could not come up with a logical use for the expanding bullets. Maybe for mountain lion defense, but that is a little more remote than bears and poachers, for me.
What do you have on your menu? And welcome to the fray, here. If you do a little searching, you will find quite a few threads on the auto's, and zero non-sense like you can get on other boards.
Craig