I don't know what the case life is for the ARC, but I do know this. The ARC sounds like a great cartridge, BUT when components for hand-loading become ever more difficult to find and are outrageously expensive when you do find them, where are you going to get them for the ARC? The .223 brass will always be out there.I am building a 6mm ARC which i plan on using for varmint hunting. What is your favorite varmint bullet and why?