You say you never heard of it? How about if it is called 7.92 x 33mm Kurz? Nope that doesn't help? Well then friend sit down and let me show you that nothing in the world is new. All new ideas came from somewhere and has been tried before. At the time they were tried they were ahead of their time so they failed. But later in history the guns, attitude, manufacturing techniques and needs of the world changed.
Developed by Germany during 1940-41 for their new idea of a short auto rifle that could be used to sweep the trenches. It was originally the 7.92 x 57 round that was made famous by the Model 98 Mauser. They cut down the case and put a lighter bullet to keep the velocity up and ended up with a short very efficent round that shot at lower velocity but with still more power than you would think.
It was designed to allow full auto fire with a rifle cartridge but still allow the soldier to control the muzzle climb. And it worked!
With 2300 fps at the muzzle and 1485 ft lbs of energy at the muzzle it was controllable and effective.
Does the idea of cutting down a large cartridge and having a short fat powder column sound like something you have heard lately? Like the WSM and Rem. UltraMag. Yes there are no new ideas around just recycled ones. LOL
The Russians gave Germany their compliment by adapting the concept and soon the whole world was jumping on the band wagon. The USA even cut down the 30-06 round and came up with the .308 "a new and exciting concept" it was touted. Smaller case, same ballistics. Russian took the idea the farthest with their SKS rifles and the 7.62 x 39mm round. But years later it was discovered again by Winchester and Remington(who copied it from PPC cartridges and the Lazzeroni)
But the first one that the German Army used was the one that started it all.