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 :
Grains | 4.0 | 4.2 | 4.4 | 4.5 | 4.6 |
1 | 733 | 857 | 814 | 844 | 848 |
2 | 744 | 810 | 815 | 856 | 824 |
3 | 747 | 832 | 822 | 856 | 856 |
4 | 752 | 809 | 824 | 843 | 854 |
5 | 702 | 847 | 848 | 864 | 861 |
Average | 735.6 | 831 | 824.6 | 852.6 | 848.6 |
PF | 147.12 | 166.2 | 164.92 | 170.52 | 169.72 |
all these were Bear Creek 200gr bullets, Wolf Primer & Hodgdon Clays powder.
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.