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Caseless ammo would be good... but it still has a lot of challenges to overcome. While I'm sure it's possible to overcome some of them, whether it's financially feasible is something else... and they still haven't solved the heat problem. See, brass acts like a heat-sink... it takes heat with it when it goes. When caseless systems fire, the heat has nowhere to go, and so it stays in the gun. This means higher temperatures in the chamber, faster, and higher temperatures in general. Higher temperatures mean more cookoffs, more wear... in fact, heat's just not that great a thing to have in a gun, period. If there is one thing that kills the idea, it will be this.
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