Your group looks about par for the course. I have a S&W 640, basicly the same gun with a steel frame. Both will do the job they were designed for. Close range, easy to carry, five shots as sure as the sun comm'in up in the morning, no hammer to snag on anything, it just works!
Shoot it some and get use to it. Try some different loads/brands. One may shoot POA and group better.
Lock and Load!