Wolff sells a 'service pack" of three springs for the Luger that has one each 40#, 38# and 36# spring. They consider the 38# spring to be factory standard for BOTH 9mm & .30 caliber. At least that's what their tag says. (I've scanned the tag but this forum doesn't permit pictures.)
I'd suggest trying the 38# spring and if it's too stiff, put in the 36# spring. I've used Wolff springs in several Lugers and they seem to be excellent. The service pack also includes an extra power firing pin spring.
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