[Sieger]

Mike;

Get hold of a copy of George W. Wilson's wonderful little book "Luger Shooting". I believe it is also an internet booklet, now, as well. In it, he explains, in detail, the proper functioning of the System Luger.

From my 47 years of 9 mm Luger shooting, here are the causes of the famous "Luger Jam":

Ammo is too strong (usually the case).

Ammo is too weak (usually not the case).

O.A.L. of ammo is too short for proper feeding through the magazine (this is the number one Parabellum performance killer). This spec. is absolutely critical to proper function!!! IF THIS SPEC. IS MATERIALLY OFF, A LUGER CAN NOT BE EXPECTED TO FUNCTION PROPERLY!!! Original German Luger ammo was loaded out, for round nose, to 1.173 inches, (29.8mms), for conical flat point, to 1.142 inches, (29 mms). As you will see, if you measure them, modern commercial 9 mm ammo is loaded much, much too shortly to ever properly fuction in a Luger!

Bullet configuration is incorrect for the magazine interior or feeding ramp. Many modern Hollow Point bullets work perfectly, many just do not.

Magazine spring is too weak (usually not the case).

Magazine lips are bent or have been "modified" in the past.

Recoil spring is either too light or too heavy (usually not the case), or has been "Ba Ba" in the past (usually the case). I might add, that a spring will, indeed, fail, especially after 68 years, minimum, of service. Please do remember that the original DWM contract, with the German government, gave a full three years warranty as to parts and labor, ha!!!

Do you handload? Why do I ask? Because there is NOTHING commercially avalable that is true to the original, German, 9 mm specs.; though 124 grain S&B is pretty close and it is accurate in a Luger (though the O.A.L. of this ammo is still too short for absolutely trustworthy function). The WWB stuff just doesn't cut it for me, as it is not accurate in a Luger, at all, and is also too short.

Here is "the load" for the 4 inch 9mm Parabellum (100% trustworthy in function and deadly accurate):

WW's Commercial Cases (new, not used).
Remington's 1 1/2 Primers.
5.4 grains of Power Pistol Powder (for me, the very best 9 mm powder, to date).
Hornady's 124 grain FMJFP bullets (this is the famous "Airforce Bullet" designed for our military's use).
With this bullet, an O.A.L. of 1.13 inches (28.7 mms) is just perfect. This spec. is absolutely critical to trustworthy function!

With the aforementioned load, I have fired over one thousand rounds, each, thorugh both my 1917 DWM and byf (Mauser) 1941 without a SINGLE JAM OF ANY KIND!! In fact, the 1917 has fired over three thousand rounds without a jam!!

By yourself a couple of new Mec Gar magazines, put back the original recoil spring, unless someone has already "modified" it, (if that is the case, the Wolff 38 pounder should work just fine), handload 100 rounds to the above specs., and go to the range and shoot your 9mm Luger, that WILL now function just like your 7.65 mms do.


Sieger

P.S. The 9 mm Pistole Parabellum was in German military service for over 40 years. Had the 9 mm Pistole Parabellum not been a trustworthy system, I doubt that It would have survived "The Great War", let alone surviving though the Second World War.