I always just shot off the bipods, accuracy was ok, since I started preloading the bipod and keep a close watch on the level, I can now hit the proberbial broadside of the barn.
seriously though I do have a 1 7/8's group I shot off a bipod at 660 yds, you'd be surprised how how accurate you can be, and green mountain tacticle is the cheapest place to buy harris bipods
JS
Do y'all think maybe the rubber feet jumping upon firing causes the verticle? I don't use a pod off a bench, anything past 100 I'm prone on the ground.