You can make Tannerite charges smaller or larger. To make smaller targets, you can simply mix a 1/2 pound target and pour the contents into a container of your choice.  It’s best if the container is not brittle, but just about any container will work.  Shooters have good luck using Chew/snuff cans as holders.  A really good idea when shooting either small targets, or when shooting at very long ranges, is to wrap the target in Duck-Tape. This prevents a spill or leak if the bullet strikes a little low, or is a fringe hit, or hits the lid on the target.  To make larger targets, simply tape one on top of the other and by hitting one, it will initiate them both…thus making a much louder target.  Common sense and local noise regulations dictate how much you can use without getting cited for disturbing the peace.