Fluted firing pins

Dwight Gruber · 12-25-2008, 06:51 PM

Jerry,

The 9mm cartridge does, indeed, headspace on the case mouth.

Recall, that the 9x19mm Parabellum cartridge case is straight-sided, but tapered. The blueprints for the P08 show that the chamber is cylinder-bored (the diameter of the cartridge base) for roughly 2/3 of its length, that is, to the step. The step is the actual diameter of the case at that point, and follows its taper from there to the end of the chamber, where it headspaces.

Frankly, as a practical matter, I would suspect that the pressure of an out-of-battery, split case would blow out the extractor rather than fracture the bolt face.

--Dwight

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12-25-2008, 06:51 PM	#17
Dwight Gruber User Join Date: Jun 2002 Location: Portland, Oregon Posts: 3,908 Thanks: 0 Thanked 1,330 Times in 435 Posts	Jerry, The 9mm cartridge does, indeed, headspace on the case mouth. Recall, that the 9x19mm Parabellum cartridge case is straight-sided, but tapered. The blueprints for the P08 show that the chamber is cylinder-bored (the diameter of the cartridge base) for roughly 2/3 of its length, that is, to the step. The step is the actual diameter of the case at that point, and follows its taper from there to the end of the chamber, where it headspaces. Frankly, as a practical matter, I would suspect that the pressure of an out-of-battery, split case would blow out the extractor rather than fracture the bolt face. --Dwight