I have 3 recoil springs for my Series 70. Two of them don't seem to work well with my reloads and the third one works really well. The problem is that I do not know what the spring rating is for any of the springs. I assume that the one that works is a lower power, but , I have no way of knowing for sure. I was thinking about ordering a wolff calibration spring kit, and was wondering which kit I should try first? And I see that they come with what I believe are firing pin springs? Or are they for the MSH? The two springs that do not work well cause FTE's and stovepipes. Anyway, thanks for any insight!