CCI standard velocity is subsonic from my 10/22. It is very accurate and it cycles as well as any ammo I have tried. With my suppressor, the action noise and bullet impact is just about all I hear.
The Quiet Gun loads won't cycle the action but I don't think they were meant to.
"No, it's not a silencer. This little doodad is my own invention. I call it a loudener." --Sledge Hammer