The accuracy is very unpredictable with CB Long rounds (also likely .22 CB short rounds) in a .22 semi-auto. The rounds will not eject properly and will lose some velocity as the bolt retracts and changes the chamber pressure from round to round. As such, the muzzle velocity will be erratic and cause unpredictable drop. CB rounds are not tack drivers anyway. Cycling them in a semi-auto adds another element of unpredictability.
Also, they will not eject from any semi-auto that I know of, so cycling the bolt by hand is mandatory. I bought a bolt action Savage Mark II at a gun show for $125 2 years ago because I wanted to shoot CB's accurately. The bolt action brings the CBs closer to something that I can call semi-accurate. Personally, I prefer the Remington 22 CBee's to the CCI 22 CB's.
Here's a review I did on the Remingtons...