I did some load work up for my 6x45 and thought I would share it here since this thread has been so helpful and comprehensive in the data contained.

Here is the load I settled on.

6x45 AR 20” Olympic Arms 1:10 bbl suppressed

Brass: LC (mixed years)
Primer: CCI 400
Powder: H335 (27.3 grain)
Bullets: 70 grain Sierra BlitzKing
COL: 2.260”
Velocity: 2975 fps (avg of 5 shots measured with Magnetospeed V3)
Accuracy is acceptable for my uses and is under 1 MOA at 100.