I find Wolf Match Target to be about the most consistent 22 ammo. I didn't find wolf match extra to be better enough to justify the price difference.
Wolf :: Ammunition .22 LR :: Champion Shooters Supply LLC
If you want the best, Lapua and Eley make good stuff, pricey though. And I used to have cheap PMC that shot really good in Marlin 700T, but it isn't made any more. .22 cal ammunition, RWS, Lapua, Eley, Sk Jagd, Winchester, Remington, CCI, Federal ammo