I have a new Kimber Custom Target II that I have had to the range twice. I have put 600 rounds through it now. All loads both factory and handloads consisted of 230 grain bullets. My 11 year old son is having a ball shooting it and he doesn't complain about the recoil but he is developing a flinch. I want to try loading some 185 grain bullets at lower power levels so he can enjoy the pistol more and learn to shoot it more accurately. The pistol has the factory 16# recoil spring and I want to know what weight spring to use for reduced loads.