It looks like the shoulder and top part of the body are really similar between the two cartridges. I'm wondering if anyone else has reloaded the x45 ammo with x39 dies. I realize that I would esessiantially be neck sizing only for the semi auto vz52, but the only proper dies I can find for 7.62x45 are custom made and cost a fortune. Anyone else tried the x39 dies and what kind of success did you have?