I tried those out of a Marlin 60 and 10/22. I had to operate the rifles like single shots, loading 1 at a time. Did yours actually cycle the action? I really liked those and CB's. (Are they the same thing? I think they are?) I might need to just find an old .22 bolt action and shoot those. They're plenty quiet for a PTC neighborhood. I know that pellets would be MUCH cheaper, though. I've got an angle on a Benjamin Trail NPXL .22 and I'm considering that, too.
Yes, they are single shot, but they feed from the mag just fine. I am getting 600+ fps, and the bullet is much heavier than any 22 pellet.
The 10/22 is a straight pull repeater with them