From the Facebook group site Cartridge and Ordnance Curio & Relic Collectors a member, Brendan Turner, posted photos of various cartridges he had just obtained for his collection. One photo showed various 7.62x45mm rounds and a 9x53mmR cartridge with an odd bullet for that cartridge, very similar to or an actual 9x18mm Mak bullet. The photo is shown below and the 9x53mmR cartridge is on the right, outlined in a blue rectangle:
I posted a question asking about the odd 9x53mmR and one person replied it was a fake while others implied it might be experimental.
Does anyone know anything about this 9x53mmR cartridge loading? Fake or legitimate?