Different countries use different fluting patterns. They were not concerned with any resemblence to an old american load in WWII in England, as they did not use the multi-ball load. Further, the flutes on the multiball load are shorter than those on the British drill round of the type shown.
I like the different flutes from different countries. I picked up a 7.9 round at St. Louis that was found in Germany and because of its headstamp, believed to be and sold as an “experimental” (there’s that over-used word again) 1930s German dummy. When I got it home, it was obvious from the flute pattern that it was an early East German (DDR) drill round, and had nothing to do with the third Reich, other than the headstamp. Like the .30-06 in question, a dummy made on “any old brass.”