the Winchester Dynapoints have yet to shoot well in any 22Mag I have seen so don't waste your money. CCI TNT hollow points were decent IIRC as is the V-Max stuff (which is what the Winchester I referenced above is loaded with IIRC). I never had much luck with any of the FMJ of any brand or any of the non-jacketed or plated loads (like the Dynapoints), the CCI V-Max loads or the Winchester Supreme (Black Box stuff) was what the local stores around here stocked that did well in mine. Didn't get to try the Hornady V-Max load, but I heard a rumor that it was the same exact stuff as the CCI version so I dunno on that one, but nowhere around here stocked the Hornady, only the CCI.

Never had the issue with the Winny stuff not firing, but there may be a quality difference between the White Box and the Black Box stuff too.