Its an oddball but I have a Martini chambered in this cartridge. Has anyone ever done any case forming for this baby. I was thinking of using a modified 257 roberts sizing die but its not going to have the same neck angle. That lead me to think about, only momentarily, about running a 257 roberts reamer into the martini to clean up the neck angle but I've discarded that idea for now. Then thought about running a 30 Krag reamer with a modified pilot into the modified die but its probably harder than a reamer could handle.
Any help out there.
Thanks