Ed,
If you don't know the poundage of any of the recoil springs in your possession (i.e. for 9mm or 30 luger), most folks will start removing one coil of the spring at a time and give it a try. It is truly a trial and error process, even if you have the correct 30 Luger mainspring. These handguns are such a balancing act between springs, ammo, and mags. Did you by chance try any other mags in this Luger?
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