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unspellable · 11-07-2003, 08:21 AM

Johnny, the cartridge does not headspave on the step. The step is 14.1 mm from the breech face while the headspace is 19.1 mm at the step between the end of the chamber and the beginning of the barrel. A point to note is the SAAMI max case length is 19.15 mm, another point of discrepancy.

So I am still wondering if they went to the straight tapered case but retained the original bottle necked chamber. The bottle neck was very slight.

At the risk of being called an iconoclast, I have a theory that the 9 mm round was developed directly from the 7.65 Borchardt/7.63 Mauser case without the 7.65 Parabellum case being involved, as opposed to the more usual theory that the 9 mm is a necked up 7.65 Parabellum case.

11-07-2003, 08:21 AM	#6
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 768 Thanks: 0 Thanked 19 Times in 11 Posts	Johnny, the cartridge does not headspave on the step. The step is 14.1 mm from the breech face while the headspace is 19.1 mm at the step between the end of the chamber and the beginning of the barrel. A point to note is the SAAMI max case length is 19.15 mm, another point of discrepancy. So I am still wondering if they went to the straight tapered case but retained the original bottle necked chamber. The bottle neck was very slight. At the risk of being called an iconoclast, I have a theory that the 9 mm round was developed directly from the 7.65 Borchardt/7.63 Mauser case without the 7.65 Parabellum case being involved, as opposed to the more usual theory that the 9 mm is a necked up 7.65 Parabellum case.