I haven't shot wax loads much but have shot a lot of the old Speer plastic red shells and the black plastic bullets powered by the Large pistol primer that fits into the red plastic shell. Changing primers is easy. They are reasonably accurate at 15 feet or so but do not shoot to the sights. I used to mark a aiming point. Making a bullet trap with a cardboard box and a piece of carpet or blanket is quite easy. The shells will last a long time and you usually can get a lot of shots out of each black plastic bullet. Warning these are not harmless!