How low does a CZ75b .40 can cycle?

[Icefire]

Well I'm doing some test load and I want to know if 135pf is too low?
The recoil spring look original (braided) and it's quite hard to cycle the slide with a slingshot grip.

 

[D_]

Ghostholster and order some lighter springs.

I you are going to hover around min power factor I would order an 11 pound recoil spring and throw in a 15 pound main and you'll have a sweet shooter.

D_