I am fairly new to firearms and need some help. I purchased a Walthers p22 last week and have put about 300 rounds (winchester wildcat 22) thru it so far. It seems that when I use one of the two factory supplied magazines the weapon jams and misfires. I have had to pry several unspent rounds out of the barrel and had many (approx 25) instances where the following round has not loaded properly. Could this be caused by the mag? Should I contact S&W/Walthers for repair? What would cause this. I am concerned as this is the firearm that I purchased to teach my son, but do not want him near this until these problems are solved. Any guidance that you can offer would be appreciated.