.45 ACP/Shanxi Type 17 Broomhandle

[alvin]

Originally Posted by sheepherder

Just to be clear - You're talking about "Mauser Export" 9mm cartridge??? The DWM #487 cartridge??? From about 1908...No relation to 9mm Parabellum or 9x21..

That's right. 9x25 Mauser Export (DWM 487). When did this cartridge appear was not clear... Julia Auction sold an engraved instance of 9x25 pistol from Sturgess collection, the pistol was supposed to be around 1904. So, I would think this powerful cartridge appeared in 1904, or slightly earlier.

But I did make a mistake. The "9x25 cartridge" in illustration was wrong. It's not 9x25, it's a much more common 9x23mm Largo cartridge (saw it longer in drawer and forgot it's 9x23, not 9x25, I don't have 9x25 ammo yet ). But that should not change above chamber fitness. 9mm Mauser Export case is 2mm longer than 9mm Largo -- 9mm Largo cartridge does not fit 7.63mm or 9x19mm pistol, larger 9mm Mauser Export cartridge won't fit them either.

[Paladinpainter]

In the interest of science, I did a chamber cast of my Type 17. The face of the bolt is recessed .048"; the chamber from where the bolt would rest (see dark line) to the mouth of the cartridge is .860 for a total of .908". The diameter of the chamber immediately forward of the extractor cut is .482" and at the mouth .474-.475".
My Speer #9 manual shows the 45acp cartridge length as .898; the diameter at the mouth of .473" and at the web of .476". So on my gun at least, the chamber is reasonable for a military weapon. I've seen others that would swallow a No-Go gauge and still have a 1/16th inch gap between the bolt and cartridge head.
I put a C96 Wolff spring kit, a new extractor, and a modern, heat treated bolt stop on my Type 17. For the 20 or so rounds I fire per year, the gun seems to be holding up just fine.
John

[sheepherder]

Originally Posted by Paladinpainter

In the interest of science, I did a chamber cast of my Type 17... I put a ...modern heat treated bolt stop on my Type 17...

I've never done a chamber cast...But where did you get your modern heat treated bolt stop???