Hi, J.LaFavor here; GA State Officer (retired), Rincon, GA. I was looking at a thread for reloading 7.65 Parabellum (.30 Luger). It is 13 years old. I use Hornady XTP .312 cal. (Hornady also lists a .309 100 grain but I haven't used any) and Lehigh Xtreme Defense bullets .312 cal. I use a Lee Precision resizing ram die.309. It produces really nice .309 bullets that scream out the muzzle. The Xtreme Defense takes more umph to resize but I do two passes and Bob's your uncle! They all mic out at .309. The factory Fiocchi bullets are .308 something. Do not know why. Barrel specs are grooves .3095.