I don't own a 6mm cartridge but seems like lots of folks were looking for 6mm bullets for a while.Except a new cartridge to reload, shoot and try for yourself. I suppose with the component shortage it gives you an alternative you MAY be able to find components for.
And I haven't looked into 6ARC brass, but I can't see the market being flooded with it. Is anyone other than Hornady even making brass for it?
I just don't see any advantage if you already have a 6.5 Grendel.