The best cheap target ammo I've found for my 10/22 is CCI SV. Nothing else in the lower price range comes close to it in the accuracy dept. or reliability(not a single failure to fire in 3500+ rounds).
modified....actually not a single Ruger part left besides the magazine so the accuracy will be much better than a stock 10/22 however it can't make a bad round shoot good. CCI SV is a good round for sure.
50 yard five shot group with CCI SV-Pretty common..overall avg generally just under .5" CTC.