I met the local guy that is involved with this caseless ammo.
Here are some different varieties, some of his project smaples, and some from my cartridge collection.
Along the top is a strip for a Hilti gun (blanks to shoot nails into concrete)
Main row L to R.
.223 Rem to compare to
original Voere 223 round for the VEC-91 rifle
UCC long type 223 (I'm sure it has a name, but I didn't get it)
UCC long type 223 showing booster (white) and primer disc (dark green)
UCC short type 223
UCC 9mm pistol cartridge, (and slug only, showing tiny stub that propellant is molded to)
UCC 22 , similar to a 22 rimfire in power
Daisy VL caseless ammo for the obsolete Daisy VL air-rifle
Thunder Charge self contained ammo for muzzle loaders
Along the bottom is a retrofit for 223 / 5.56x45mm rifles. By using a cut down 223 case and conventional primer (rather than electric primer), and a molded charge, a rifle can accept a "semi-caseless" round.