I am having a problem with my 38spl revolver. It is a Taurus 85SS. This is an older gun that has not been fired very much. When I bought it, it had set in the guys gun safe for about 8 years and had only had maybe 100 rounds if that in those 8 years. The gun since new has only had about 300 rounds through it. The problem I am having is that when I fire it, it will fire fine for maybe 8 out of 10 rounds. It is like the hammer does not drop hard enough to fire the round. I can pull through the misfire and come back around to it and then it will fire on the second time. I am not sure if I have a weak spring or what. How can I figure out what is causing this.