I'm surprised that everyone who talks about Caseless Ammunition seems to have conveniently forgotten the VOG-25 grenades that the Russians currently use, which are completely caseless. Saves time when loading them since you don't have to extract a case, which definitely comes into play when loading a revolving multiple grenade launcher (perhaps it could even help another version of the XM307 "Grenade-launching machine gun" work better).
But yes, Caseless Ammunition definitely has some interesting applications. If a major military adopts the 6.8mm round en masse, Caseless Ammunition could be the weight-saving measure they need, since the round will obviously be larger than the 5.56mm cartridge. That's assuming the increased cook-off possibility, increased heat load, and need for an "emergency extraction mechanism" to manually extract the occasional dud round problems all get worked out, of course . . .
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