I'm having a .22-6mm Remington made. Since the project was first started there has been no 6mm Remington brass available. I do have a pile of Berdan primed 7x57 brass and an annealing machine, so I should be able to run the brass into a 6mm Remington then into the .22-6mm Remington die then trim back to 57 mm and get the basic shape done then ream the necks if they're too thick. Anybody have any experience they'd like to share that might make this go a little easier?