I had to invest a few bucks and labor to achieve the accuracy stated in a couple of posts. I do not question the voracity of your statements but I must say that you have fired some rare 10-22s. The l'il rifle is able, on an average, to get around 1 1/2"-2" @ 50 yards.
To achieve this accuracy with the usually atrocious trigger of a 10-22 is good shooting with some concentration. Ammunition definitely plays an important role in the accuracy game. I find the regular velocity CCI Mini Mag and my built up 10-22 gets along very well. 'Course, the 8X32X44 helps a lot.