I've got an old box of BELL 43 Mauser cases. They are about 0.5" longer than spec, which isn't an issue. However, the case mouth i.d. is about 0.375 compared to 0.43 with a new Bertram case. I've got the RCBS 3-die set. Will the expander die work to increase the diameter for the full length of the neck? I was hoping on getting some advice prior to shoving an expensive case into an expensive die.