I am wondering if my problem with shooting consistently small groups from the bench over sandbags is that the sandbag which I rest my Ruger revolver on is too hard. I have tried both a bunny ear leather bag stuffed with fine sand and a lead shot bag full of shot. Both are quite hard and I wonder if the gun is kind of bouncing off of the bag. Could this be a problem? Should I be using a softer bag? Thanks, Brian C.