This video teaches the secret of making a tinfoil bullet for a paper gun that shoots far. An excellent summary is given below. First start by rolling the tinfoil leaving one side wide and the other side narrow. After rolling it up tear a little piece from the narrow end of the tinfoil. Open it up, insert your finger inside and adjust till it becomes cone shaped. Now put that in your gun and shoot, it will go far as expected. Add some weight if you want to make it go longer. Follow the above the steps and try to make your own tinfoil bullet for a paper gun that shoots far and enjoy.