I shot a bunch of it out of a 1911 a while back. Shot through one gallon jugs filled with water and then into a box filled with soaked newsprint.
The Pow'rBall fed great and had great expansion, almost to the point of disintegration really, but it consistently showed pretty lousy penetration. Worse than anything else I shot, measurably worse even than some .380 loads I shot out of my little LCP.
I'm pretty OCD about this sort of thing so I actually counted the pages.
165 grain Pow'rBall penetrated on average 395 pages of wet newsprint.
230 grain Golden Sabers penetrated on average 615 pages with full expansion.
230 grain Buffalo Bore penetrated nearly 900 pages on average.
230 grain Federal HST was somewhere between the Remington and Buffalo Bore, but I don't have the exact number on me right now.
Now, I realize my little hillbilly backyard ballistics test is hardly up to FBI standards, but the difference in penetration between this load and the proven standbys like Remington Golden Sabers and Federal HST was pronounced. Enough so that I haven't carried any of the Pow'rBall since then.