Mark:
No, stingers aren't really target ammo at all; they're too fast. Target ammo tends to stay under the speed of sound, since breaking the sonic barrier causes some slight instability. But few of us are probably good enough shots for this to matter; I'm sure not. The other thing you pay for in high-quality target ammo is SD, Standard Deviation. That is, rounds that cost a dime a piece are going to be very consistent in bullet weight, powder charge, etc., every time; and that consistency converts (again, if you're able) into remarkable accuracy.
I don't know what your particular gun's preferences are going to be. 22s are notorious for having distinctive ammo preferences--sometimes even from gun to gun within the same model. I do know that among Ruger afficianados, a standard recommendation for most reliable performance is CCI Minimags. They aren't top-flight target ammo, but they're not big-box bulk stuff, either. If your pistol is still breaking in, you might try shooting a few hundred (or better, thousand) of these--they have enough oomph to work the action smooth and are smooth and consistent enough that I've never had any feed or ejection problems with them (as I have with some other rounds).
cg