Your problem with the powderless/CB 22 ammo is that those rounds may not create enough blowback to properly cycle the action. Using those in a revolver is one thing but I don't think I would try them in an automatic.
Having an automatic you do have to be somewhat careful with ammo, I have had trouble cycling non jacketed rounds in my automatics at times. I can tell you my Ruger 22/45 is much more fussy than my Colt 1911/22 with the non jacketed stuff. Stick with a copper jacketed slug and you should be fine. Also keep your action clean, 22 ammo shoots pretty dirty and that can screw things up for you too as the breech can get sticky after a while. I keep a cleaning rod and brush on hand when I go shooting and run the barrel every now and then.
Good luck finding ammo and with your SR22. I know several guys that have them and love 'em.
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