I am away from my notes but as I remember, Schirneker lived on the Canary Islands. He was a very prolific inventor and I think this is one of his earlier ideas. It was tested at both Colt and Geco/DAG. It required a modified magazine to keep the cartridges properly aligned so they would feed. The two Colt rounds I have (round nose and pointed bullets) have the beveled side like the WRA round pictured above, and were from the Colt test via a collector who was very close to Rob Roy, a senior guy at Colt. The DAG round I have came from the collection of a German forensic specialist who worked in a police lab. It has the two grooves on the head of the case for alignment.
I think all three of mine have copper projectiles, as do the ones I have seen in the Woodin Laboratory. This was necessary so the projectiles could bend as the went around the curve in the outer circle of barrels. The test gun at Colt was a Luger pistol, and I believe the DAG/Geco test was also done with a Luger pistol. I don’t know the reason for the ports in the barrel, and can only speculate on what they might be for, but I’d rather hear others opinions.
Ibelieve the bullets on the far left and third from the left were for the 45 ACP case but I have never heard of a weapon in that caliber. I was told the projectile on the right above the case head was for a drill round. I was also told that the intention was to scale this concept up to an assault style rifle. Finally, I was told this system didn’t give impressive results, particularly with regard to probable wounding effects.