So why not 3-D print bullets and shells? If a 3-D printed gun can withhold the pressure of the explosion, why could a 3-D printed bullet or shell do the same? Seems like a logical leap. Now we just need to ask the question about the powder but I suspect, that there are other explosives that can do the work, just that powder as it is developed to today’s standards, is just the most efficient.
Just musing here.
JoMa
Metal storm doesn’t use cartridges.