I have a S&W 317 AirLite .22 revolver which shoots right to my point of aim, which is strange for me since I usually pull to the left if I'm not focusing on my fundamentals. After adjusting the rear sights all the way to the left, it still shoots a little to the right. Also, it has a tendency to spit something (powder or lead?) on me when I shoot. Is this a sign my revolver has a timing problem or is it just user error?