i got an idea when u shoot something. get one of those bigtime stick smoke bombs u know the ones that are like 50,000 cubic feet of smoke, the onese that u start by pulling a rip cord. tie a string to the rip cord with a 15ft small twine rope and the other end to the muzzle break. Incase it in a simple 3" diameter sabot like device, roll tape, launch and watch the smoke trail go, then it will also mark the area it lands, believe me they last a long time, used them a couple times in paint ball. id love to see a video of that. and if ya want to go into the darkside, it wouldnt be to hard to make some kinda exploding shell for it. take a can on 3" inch diameter, fill with explosive/firework of choice, rig a simple battey and fuse(rocket model starting fuse is a good choice) and tie wires to fuse and a nail in top, attach a drag source to the bottom of can, nail out the top, will land nose down, pushes pin in, completing circut and KABOOM, remember this is simply an idea, i dont indorse said activity as it can lead to breaking laws and/or injury/death, thankyou :)