How Accurate are Cleaning pellets?

 A ..177 cleaning pellet weighs around .25 gram and come out my PCP around 1270 fps (yes, supersonic crack that sounds like a 22). That's about .9 ft/lbs of energy. They will not even penetrate a piece of cardboard (they will dent it and bounce off) 5 feet away. At 10 feet I missed a 8x10 piece of cardboard aiming for the center. They are not at all accurate.