Forget the sand bags(used them for years) forget the Lead sled(mine is now for sale)Forget the Caldwell bags and go with the Bulls Bag. I was using my friends Bulls Bag and I shot the best group of anything I have ever shot. This was with a new to me rifle. Did some checking on line and found one to purchase for my self. The kicker was that this bag has a 100%lifetime guarantee. If you are in Vermont and want to come try my Bulls Bag PM me.