I claim the prize for the most unusual U.S. military experimental cartridge of recent years. This is a .26-caliber recoilless cartridge with an electric primer. The interior of the cartridge and brass case act as the electric ground. The round is 10.5 inches long, and was designed for salvo-fire against incoming RPGs. In concept, radar mounted on armored vehicles would detect an incoming RPG, train the salvo launcher on it, and fire a salvo (total number unknown) of .26-caliber brass projectiles. The recoil was absorbed by the slurry in the back of the cartridge, which was blown out the back of the case, reducing the recoil felt by the launcher to almost zero. The drawing is not to scale, but does depict the round shown. I acquired a small handful of these from the contractor who assembled them, and I have no other information about the experiment.
Anybody ever seen another one, or have more info?