If I can't find good CCI ammo, I have been trying some Aguila SuperExtra. Some folks call it "The Mexican Mini-Mags", and think highly of it. I don't know that I'd go that far, but it sure shoots well in my little Ruger SR-22 pistol. I haven't had time to try it in a good boltaction .22 yet, but I have high hopes.
That stuff kills schit really, really, well.
Dave