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unspellable · 09-23-2012, 05:55 PM

Sieger, long time no hear from you. Mostly my fault, been moving around a lot.

Re the stepped chamber. At the dawn of time (pre 9 mm Parabellum) when Luger & DWM were developing a 9 mm cartridge they first took a 7.65 case and necked it up to 9 mm leaving a very slight shoulder. (Some believe this was the version they tried to sell to the Brits.) The shoulder was too slight for reliable head spacing so the next step was the straight tapered case that became the 9 mm Parabellum. I'd always wondered if the chamber step was simply the older 9 mm chamber and they never bothered to remove the step.

Any opinions on this?

09-23-2012, 05:55 PM	#35
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 768 Thanks: 0 Thanked 19 Times in 11 Posts	Sieger, long time no hear from you. Mostly my fault, been moving around a lot. Re the stepped chamber. At the dawn of time (pre 9 mm Parabellum) when Luger & DWM were developing a 9 mm cartridge they first took a 7.65 case and necked it up to 9 mm leaving a very slight shoulder. (Some believe this was the version they tried to sell to the Brits.) The shoulder was too slight for reliable head spacing so the next step was the straight tapered case that became the 9 mm Parabellum. I'd always wondered if the chamber step was simply the older 9 mm chamber and they never bothered to remove the step. Any opinions on this?