I've got a remington 700 muzzleloader with a scope on it. I have been to the range 5 times with it and am getting 3.5 inch groups or better at 100 yards. This is all the experience I have at the range or with any rifle. Have always hunted with shotgun with slugs and open sights. While at range I have seen some folks using litte sand bags under the barrel and stock of their rifles. Guess what I'm asking does these bags help much and how much does a pair of them cost?