Tried a box of the Glaser 9mm PowrBall self-defense ammo at the range tonight. It's a very small 100gr bullet, with a round polymer ball for a tip, so that it feeds like ball ammo and will penetrate deeply (and through clothing, etc.), but supposedly will still expand. Its leading attribute is that it will not get plugged or hung up on clothing or other natural barriers, due to the polymer ball in the tip, but it still penetrates and expands with extreme reliability. And it's got awesome ballistics for 9mm +P ammo.
Muzzle velocity: 1475 fps
Muzzle energy: 483 ft./lbs.
Penetration: 12" in 10% ballistic gelatin
**Note: Penetration and expansion results I got from the HiPowers and Handguns site (http://www.hipowersandhandguns.com/CorbonPowRball.htm
Interesting that these ballistics give the 9mm Powrball round greater velocity and muzzle energy than the 45 ACP Powrball round, although of course the 45 is using a 165gr bullet, so the size would hopefully more than compensate for the lack of energy and velocity. Anyway, this is some very interesting ammo technology; see more about it here:
Fired about 20 rounds through my XD subcompact, all fed and fired reliably. Wow, this stuff generates some serious recoil, it kicks like a mule, and really barks in the little Springer. Still, I found it was pretty accurate for self-defense ammo; I managed to keep 18 out of 20 in the black area of the target (6") at about 25 yards, shooting offhand. I'm curious why it seems to generate so much felt recoil, even more than other types of defensive ammo I've tried that have similar ballistics. And remember, this thing is also using a very tiny bullet!
One interesting problem. I tried a bunch of times to get the stuff to work in my CZ 75 SP01, and it would not feed without jamming, even though one of this round's claims to fame is that with the ball ammo-like shape, it should feed well in most pistols. Every time I tried to load a mag, the short bullets would cause a jam I think because of the very steep feed ramp in the CZ. Though I've fired several hundred practice rounds and self-defense rounds of different types through the new CZ, without ever a FTF or FTE yet, this stuff would not work no matter what I tried. It's the first ammo I've found that gave the new CZ any trouble, but clearly it was due to the steep feed ramp and the small bullet size, you could see how the small bullet was getting pushed up too high and jamming against the roof of the slide, rather than going into the chamber.
Finally, because of the supposed deep penetration characteristics of this ammo, I wonder --assuming you used a decent caliber (say 40 or 45) for hunting--if this ammo would make a good hunting round. I also wonder, comparing this round to the other excellent defensive rounds offered by Corbon and Glaser (specifically, the standard JHP ammo, and their DPX "deep penetrating" line that uses the Barnes bullets), which ammo type is most effective overall for self-defense.
Follow-up note: A guy told me in a CZ owner's forum, that Powrball ammo is actually known for having this feeding problem in some guns. The point this illustrates is, ALWAYS ALWAYS test-fire a good quantity of your self-defense ammo in the gun in which you'd be using it, so that you'll know if you are going to have issues like this. To me, even if your self-defense ammo has one unreliable feed in 50 rounds, that's still one failure too many considering it's ammo you're entrusting your life to. And you want to know that in advance, so you can get rid of it and get something reliable. I think this Powrball WILL be reliable in my Springer--and it's otherwise great ammo, because it's giving me the stopping power of a .40 or .45