MidwayUSA say's they're getting them on 10/24/2011. I haven't seen anything on them until just now. Didn't even know they were making them. They use the same FTX (Flex Tip Expanding) bullets that all the LeverRevolution ammo use, which I have heard good reports from. I've used the 30-30 LeverRevolution, and while I haven't hunted with it, it shoots more accurately than flat nosed ammo in my rifle.
I'm sure this will be some good ammo, and at $15 for 50, isn't too terribly high priced.
Critical Defense Ammo 22 Winchester Mag Rimfire (WMR) 45 Grain Flex Tip eXpanding Box of 50
*EDIT* Just looked it up on Hornady's website, and it says that the powder is optimized for short barrels, so it should perform well in your pistol.
"Breathe when you can, shoot when you should."
"Qui desiderat pacem, bellum praeparat; nemo provocare ne offendere audet quem intelliget superiorem esse pugnaturem"