The heavier the sand bag the better your groups will be assuming the platform your shooting on is just as stable if not immovable. Bench rest shooters understand that weight is a good thing when trying to shoot small groups. The heavier your bag the less it will move prior to, during and after the shot. Look up "heavy sand" if you want to maximize your bag stability...its 5x heavier than your standard play sand and its what I use in my bench gun bags. As for bi-pods, shooting great groups can come from them also but it depends on the quality of your bi-pod, technique and how much you practice with it. Here's a quick tip for shooting rim-fire...instead of gripping them like a full size center-fire rifle, try "pinching" the trigger instead by using only your thumb at the back of the trigger guard and trigger finger on the trigger. Pinch each shot off gently and see if that helps your groups. It usually does. Most if not all shooters in the rimfire club matches Ive shot in utilize this method with great success.
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