Went to the range this weekend to test various ammo because of the above subject problem. 50 rounds CCi Maxi Max HP ammo no misfires & great accuracy. 2 rounds Winchester Super X JHP 40 gr. 1 misfire. I was going to leave the range a little disappointed with Winchester 22 magnum ammo, but decided to finish off the box of Winchester Dynapoint 45 gr. ammo that I had the original problem with a few weeks ago. Shot approximately 20 rounds with no misfires. After that I wanted to try additional rounds of the Super X JHP that I had 1 misfire out of 2 rounds (misfire did go off the second try after rotating). Shot approximately 20 round of the Super X with no misfires. At the present time I probably would have more confidence with the CCI than the Winchester. May try some Federal in the near future if I can find them. I am hoping because of the newness of the firearm the problem is minor and will correct itself with more use. Any ideas or comments would be appreciated. AndyB