Re: Best 22 Semi auto
I've owned a couple of Remington 552 rifles; one brand new. Accuracy was, at best, only average. Both were sold for exactly that reason.
For out of the box best accuracy, the Thompson Center may be the answer although I don't care for the mags they use. If economy is a priority, the Marlin Model 60 is generally pretty decent.
If you want to go the customize route, the 10/22 has no equal but don't expect a tack driver out of the box. You can turn a 10/22 into a 50 yard one-hole rifle but it won't come cheaply.