Originally Posted by Boxerglocker
You could safely start at about 4.0 to for testing purposes to make your requirements. I know several using Solo with 9mm 124 RN and depending on the bullet are all loading 4.2 or greater with OAL of 1.130 or greater (limited by driving band).
You are right! This is what I found out: 3.9gr of SOLO 1000 behind a 125gr LRN makes PF out of a G17. I decided to bump it up a tad to 4.0gr just to make certain that any weather variation won't throw me sub-minor.
I choose to go with an OAL of 1.120 and there are no obvious signs of pressure.