[Thor]

My opinion is the 36# spring sold by Wolff is just about right for a 4" 9mm shooting standard American Ammo. If you shoot only +p stuff the 38# spring might be the way to go. I shoot two handloads with 124 gr, one at around 1150 fps for the standard loading and the 124 at 1250 fps for Artillerys or if a client is specing that is the load to design the rework around. ALL and I repeat all springs from Wolff are really for the 9mm and will have to be cut to make most 30 Luger ammo work unless you hand load then the 36 # is my choice. It is pretty hard to get a 30 to close like you sugguest with a spring that is weak enough to function right with the weak 30 ammo on the market (FIOCCHI 30 Luger) A good spring in a 9 should do this though! Tom Heller mentioned that the ORIGINAL Luger springs (not the same as Wolff) had around 16 coils and a 9mm of the same type spring (same wire, same wrap rate) would have about 19 coils. The 30 was designed around a weaker spring IMO.