Hmm... I have the Ruger 10/22 carbine model and it eats ANYTHING I give it.

Try taking her apart and give her a good cleaning and lubing and try again. I have yet to have any problems with mine, even with aftermarket mags that every one says are horrible.

I do think that the "Eley" ammunition is becoming something of an accuracy standard ammunition if you want to try to pick up some of that. It can be found at ammotogo.com for a decent price.