Lapua and Eley make very accurate (and pricey) .22lr ammo.
Here's Eley Tenex for $170/brick:
http://www.midwayusa.com/viewproduct...tnumber=140858
and here's Lapua X-act for $290/brick:
http://www.midwayusa.com/viewproduct...tnumber=960276
I'd stick w/ the more moderately priced Wolf and CCI ammo, however, unless you're shooting some Italian-made Olympic bullseye gun.