You might try Trail Boss also. Instructions for load development here:
Trail Boss will help keep noise down also since 100% powder burn occurs in the first inch or two of bullet travel. On the other hand, that may also cause low enough pressure to not work the action. I'm not familiar with the AR internals.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.