East German "Ubung" practice ammunition. They are not "short range", rather they are "reduced range" allowing them to be used at ranges with limited downrange danger space. They were used out to 500-600 meters, requiring a increased rear sight adjustment for longer ranges. A informational sheet to this effect was packed with each crate.
The projectile is approx. 62 gr. with a chemically blackened steel jacket and plastic core. The primers are corrosive. These projectiles are just as dangerous as regular ball ammunition and I have personally shot them through 6-8" diameter trees.
Back when they were dirt cheap, it was good blasting ammo. Very little collector value, but a unique item to have.
There is a tracer version, identified by an all-green lacquered projectile, but I have not seen any in shooter quantities...