There have been some pretty fascinating experimental weapons over the the years. For example, the H&K G11 [0] used caseless ammunition. The potential advantages

There have been some pretty fascinating experimental weapons over the the years. For example, the H&K G11 [0] used caseless ammunition. The potential advantages of that are no need to eject a spent casing and a soldier can carry more of it since it weighs less. [0] https://en.wikipedia.org/wiki/Heckler_%26_Koch_G11 https://en.wikipedia.org/wiki/Heckler_%26_Koch_G11