start at 74.5 and go in .3 increments, at 75.8-76.3 should be a sweet spot, but i would go to 77.2 to be sure your not leaving nothing
on the table, you may see a node aprox-every 1.2-.4 grains.
after you find your powder node work your seating depth.be safe and keep a close eye on psi.
a 200...