Black Hills is loading ammo for it.
I expect 6 ARC and 22 ARC will take a little time for companies like Nammo, Federal, Winchester to start making it. Maybe even a similar timeline to 6.5 grendel where it took several years for it to have enough market pull to motivate the companies to do so. Neither of these cartridges are really marketed to the hunting communities where the traditional ammo manufactures see opportunity to load many different combos (see Hornady's other PRC and creedmoor offerings taking off very quickly). For comparison for a similar cartridge, the 224 Valkyrie, Hornady was the only other manufacturer outside of federal to support the round for a few years.
I could see Federal offering a GMM loaded with some Berger bullets in the future.