I bought a new S&W .45 revolver several years ago and I find myself shooting it more now. I was shooting a match at a local club last weekend and had several "click no bang" moments . I examined the primers afterwards and found only a very light pin prick of a dimple. The rounds that went off had heavy dimples in them. These are reloads but I make sure the primers are seated fully. I took the grip off the gun and tightened the hammer spring screw a quater turn and reshot the gun with no further problems that day. I had marked the screw to see if it was backing out during shooting and it seems it does back out some with repeated use. However, the trigger pull is pretty heavy now with it not light striking and it seems there may be another solution. When the light strikes occured, the trigger pull was still fairly stiff. I'm also wondering about the firing pin legnth??? Any suggestions would be appreciated. I'm considering having the Performance Center do an action job on it and ask them about the problem as well.