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After a bit of research...
What I'm really dealing with here is a propulsive cartridge, normally found as a line or grenade launcher cartridge.
There are two extant, the M195 for the 5.56, and the M64, for 7.62. More interesting to me would be the M32, which is a line thrower for the .45 ACP. This one uses a pair of felt wads to replace the crimp.
Evidently, the normal pattern is to load with standard powders (IMR4427 in the 5.56) and then use a "blank" crimp to hold the mess together.
Charge weight appears to be heavier than normal, due, no doubt, to the expanded volume of the chamber plus barrel. Anyway, I've a starting point.
So, it looks very possible, having already been done.
Like I said, though, 500 feet away on the other side of the hill....
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