"I can't figure it out; maybe it takes two years to load the one million rounds."
- If this is the same idea that I think it is, it's been around for a lot of years. As I read about it then, you marry a bullet, not to a brass casing, but to a solid propellant like that used in sold fuel rockets. The solid fuel can be ignited by anything from an electrical current to hot burning gasses from the previous round.
In this idea, it seems they have produced tubes of bullet/propellant, bullet/propellant, etc., all fused together in any length you want - then stuff the tubes into a barrel and let her rip. It's not clear from the story if the barrel is then discarded or what happens to it. The problem with the concept was that the barrels became quickly dirty with unspent propellant and, more importantly, without rifling in the barrel, the bullets were not accurate.
Wouldn't it seem logical that if you could fuse the propellant to the projectile that a rifle that could case, say, 500 rounds, to be fired singly or in clusters, would be the way to go?