I use decorative sand from Wal-Mart....works great, is clean, and easy to undo if you want. I just take two Q-Tip sticks and put them in the recoil pad screw holes so the sand does not go there....you don't want it to go there! been there done that!...and pour the sand in the stock. No rattle, no mess, no fuss. Makes a hollow stock very solid.