What is the meaning or purpose of a knulred cannelure in the case of this 7.65 mm Parabellum made by Fiocchi? I don’t think there is anything special about this cartridge, but why was it made this way?
Fede - while not on this forum, I have been asking that same question for about 35 years or so. I have the identical cartridge you show, and it is the only case-cannelured 7.65 Para in my collection of ball cartridges (some dummies many have them, but I have forgotten off hand; it doesn’t matter anyway because they are there to ID dummy rounds, clearly.), including other variants from Fiocchi.
I haven’t a clue why they did that. It most certainly has nothing to do with dealing with bullet set back. My best guess was that it was a proof load, since for many years Italy has allowed the same guns in 7.65 Para that they prohibited in 9 mm Para. Still, I am not even 20% convinced of that being the reason. Years ago, I wrote Fiocchi, but never got a reply.
John, thanks a lot for the help.
Maybe by mistake they added a manufacturing step intended for the 9 mm Parabellum case.