Kinda bags??...leme think....umm....paper..nooo, umm...plastic, nooo,....SAND BAGS!!! BWOHAHAHHAHHAAA!!!!!!
I just use a couple shot bags filled with sand, a Hoppes front rest/with one of them shot bags, and a rabbit ear rear rest over anther shot bag. The rest entails a good POA and NPA along with a rock solid hold. I pull the stock in TIGHT with the right hand (trigger hand), and then curl my left elbow nook around the gripping hand and let my left hand hang loose, while keeping the right hand/arm/shoulder/stock tight along with the tight left elbow cradle with a good slow trigger pull (you never want to know when the shot fires, it should always surprise you) ...and then the concentration and angle of attitude makes up for the other half of the shot.
\But then again, that's just how I do it. What works for me may make you shoot 5's!