Currently I'm running a 25# Main Spring, with a Flat Bottomed Firing Pin Stop, and a 20# Recoil Spring in my Government sized 10mm.  I really didn't want to go over 20#, as that might cause frame battering.  My empties land about 15 feet away.

I run the 25# main spring and  23# recoil spring and the Flat Bottom Firing Pin stop no frame battering so far