Muddy, that's good advice. One of my .22s is a bolt gun, however, and it won't fire the duds either.
All 4 of my .22s make nice, sharp firing pin strikes (and thus are clean enough to function properly) and none will fire the GB duds. If the first one I try a cartridge in won't fire it, none of them will.
I haven't tried GBs in a CZ, because my CZ is a .17. I would feel pretty safe doing it with a round that had ftf in my .22 rifles and pistols though.
