Thanks for the help, the springs should be here this week, hopefully I can try them this weekend, and I'll let y'all know how it went.

Thanks, for the info, gonna try those out. What kinda velocity are you getting with that load?

I just bought a Springfield TRP longslide and a Kimber custom eclipse. I plan on shooting only underwood 180gr and 200gr or the handrolled equivalent in them. Would a 25lb main spring, flat bottom firing pin stop, extra power firing pin spring, and 18.5 recoil spring in the long slide, and 20lb recoil spring in the standard slide be enough, or should the spring weights be heavier?