So I went to shoot my s&w 500 today. I loaded it up and went to cock the hammer. The hammer wouldnt go back. I noticed that the back of the casing was getting caught up on the firing pin. I unloaded it and tried pushing the firing pin back and it wouldnt budge. I tried dry firing it and the pin didnt move at all. What could be causing this? Could something be stuck behind it?How good is s&w's warranty? Im the second owner of this gun. Will that be a problem with s&w warranty department?