1. Savage A22 Pro Magnum Varmint 2. Rock Island Arsenal XT 22 Magnum Pro 3. Smith & Wesson 648-2 Stainless 4. Ruger Single Nine 5. AMT Automag II (unfired) 4 out of the 5 fired everything I put through them. CCI, Armscor, and Winchester, not one malfunction or light primer strike. Which has, in my experience, been fairly common in CCI 22 WMR. What didn't work? What failed to fire at all, in any way shape, or form? The brand new Smith & Wesson 648-2. It refused to fire on double or single action. I ran the cylinder around 2 more times just to see if I could get one to go off. Nothing. When I went to eject the cartridges, the ejector star went right past the cartridge rims leaving them all in the chambers. It never snagged one. When I looked at the unfired cases they all had 3 very light strikes. I put them in my other guns and the rounds went off perfectly. The failure to eject and the light strike has got to be related. I'm assuming that since the ejector star isn't under the case rims, the cases aren't being held close enough for the hammer to strike them hard enough. The ejector star surrounds the case rims but is never under them at any point. I was worried about the Rock Island having reliability problems and it ran flawlessly. Out of the entire pile of firearms, I would never have bet that the S&W would be the one going back for warranty service. I called Smith & Wesson on the way back from the range and they emailed me a FedEx shipping label. I finished shooting at 2:00 PM. It was gone by 4:00 PM.