Caseless ammunition, or telescoping ammunition (or both at the same time.) Either could conceivably increase how much ammunition soldiers can carry, but I'm n

Caseless ammunition, or telescoping ammunition (or both at the same time.) Either could conceivably increase how much ammunition soldiers can carry, but I'm not holding my breath for either. The status quo seems firmly in "good enough" territory and I'm pretty sure some of the other supposed benefits of caseless will fail to manifest. In particular, advocates of caseless ammunition have on occasion claimed that guns would be simplified by not having to eject brass, but I don't think that's true since said guns would still need a reasonable way to eject chambered but unfired ammunition (even if it was open-bolt.)