Wolff mainsprings

unspellable · 09-03-2002, 06:02 PM

The Wolffe 38 lbf spring is based on a spring Wolffe measured from a WWII vintage Mauser. If it was a factory spec spring it would be for a reasonably hot 9 mm load.

The only definite factory specs I have turned up so far are for the recoil spring in the DWM New Model chambered for 7.65 mm.

Free length: 3.346 +/- 0.0098 inches, 19 coils
Preloaded: 1.969 inches, 18.75 to 24.11 lbf
Loaded: 1.338 inches, 33.07 to 36.37 lbf

Fiocchi and Winchester 7.65 ammo are loaded too lightly to provide reliable functioning with this spring, hence the abundence of odd and cut springs that you find in Lugers. I advise against cutting any original spring on grounds you've altered the pistol and it will not have the correct preload force. Plus, you will want a standard spring to shoot handloads that are up to snuff. Lay it to one side and put in a replacement spring. I'm still trying to find a good source for replacement springs as the Wolffe springs are too stiff for the 7.65 mm chambering.

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09-03-2002, 06:02 PM	#6
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 768 Thanks: 0 Thanked 19 Times in 11 Posts	The Wolffe 38 lbf spring is based on a spring Wolffe measured from a WWII vintage Mauser. If it was a factory spec spring it would be for a reasonably hot 9 mm load. The only definite factory specs I have turned up so far are for the recoil spring in the DWM New Model chambered for 7.65 mm. Free length: 3.346 +/- 0.0098 inches, 19 coils Preloaded: 1.969 inches, 18.75 to 24.11 lbf Loaded: 1.338 inches, 33.07 to 36.37 lbf Fiocchi and Winchester 7.65 ammo are loaded too lightly to provide reliable functioning with this spring, hence the abundence of odd and cut springs that you find in Lugers. I advise against cutting any original spring on grounds you've altered the pistol and it will not have the correct preload force. Plus, you will want a standard spring to shoot handloads that are up to snuff. Lay it to one side and put in a replacement spring. I'm still trying to find a good source for replacement springs as the Wolffe springs are too stiff for the 7.65 mm chambering.