I've owned 2 10/22s.
Still got one in NZ.
Neither of them could group.
1"+ at 25m with the Ruger 10/22 and 0.5" average with my 47 year old BRNO No2.
I remember getting the Brownells Catalogue when I was gunsmithing, it had a huge range of aftermarket parts for the 10/22 - SS Recievers, precision bolts, new screw in barrels, new trigger groups and fancy stocks.
They are bit like the Rem 700, you buy one and then gradually 'improve' it until only the sling remains of the original rifle.
Having said all that I love them as a short range rabbit rifle and plinker.