I am curious...
How well do these over the powder wads hold together at say 25 yards?
My best,
Blair
Although these "coiled cardboard bullets" appear pretty substantial when loaded into a cartridge, and nicely take the place of a real bullet to achieve a suitable OAL for feeding through a repeating rifle action, as mentioned above they don't "hold together" at all when fired, in my experience. If not blown to smithereens, they uncoil and drop to the ground inside of 10 yards or so, thus posing little or no hazard.
The chap who came up with this idea had to get them approved by the "safety nazis" of Parks Canada before they would allow their use at re-enactments at their historical sites. He convinced them by stretching out a big sheet of paper (newsprint, as it comes off the roll and sometimes get used for disposable table covering, or whatever) and then firing a series of such blanks at it from a distance of about 15 yards. None of the coiled cardboard wads even reached that far or caused any damage to the paper at all!
However, don't use anything but wet/dampened soda-carton cardboard to make them - you certainly don't want to make them any more "durable" by mixing anything (white glue or whatever) with the water, or they might not disintegrate properly ....