Anschutz actually have made 5 different versions of their semi auto: 300, 470, 2 different 520's, and the 525. For me, the 525 and 470 that I owned were the most accurate out of the box. Presently, I have a 300 from 1968, it has a recessed factory crown, I've seen one other from 68 that had the same crown, all the earlier and later ones I've seen do not have this crown; I made one modification to it, I put a 525 bolt and spring in to it. When our weather breaks I will test it for accuracy.
Next to the couple Annie's that I owned, I agree with reg that the voere's are extremely accurate, I had a 2117 and it shot very well and had an adjustable trigger to boot. I also have a beretta "sport" 22 semi rifle that is quite accurate.
I have an infinity for semi auto 22's and have owned many different new and old ones over the last few years, I think what it boils down to is personal taste and how much you want to spend.
Ross B.