For my Wilson Combat AR9 with a 14" barrel I use very fast powders. 3.3gr - 3.4gr N310 @ 1.130, with a 115gr blue bullet. I tuned the buffer, spring, short stroked. I don't worry about the comp as there will not be enough gas after 14" - 16" of burn in the barrel to work the comp no matter how slow a powder you use. My dot hardly moves and I get 130pf - 135pf. I have tested 115gr, 125gr and 147gr bullets. Fast powders - Slow powders. N310, N320, SP,N330, N350 Auto-comp, 3N38. The fast burning powders will give you the least amount of dot movement, you will make PF with the smallest powder charge in a PCC with a 14" - 16" barrel. in a pistol my load only makes 109pf - 116pf