Develpp reliable plastic casings and an commonlyly available substitute for primers and you have it. This sort of thing should be top priority for gunsmiths and reloaders who have the resources for experimentation.I don’t know much of anything about ammo but can some form of rimfire bu used tor, say,5.56 or .303?
Seems to me that 3D printers are already capable of producing guns. So much for gun bans.
***Develop reliable plastic casings ***
Didn’t the Dardick automatic revolver use a three sided plastic case for its “tround”?