Chrono-ed my new rounds that I made with my new 550B today after the match. Although my Chrony was not working, a fellow shooter Scott loaned me his and I managed to chrono 5 different types of powder weights. here’s the table :
So in order for me to make the Major Power Factor (165+) I’m going with 4.5 grains of powder. 4.2 is pretty inconsistent so I’ll stick with 4.5. Time to get to reloading those thousands of rounds I have.