Do you have a picture of the AR you shot that last target you posted? That group is a thing of beauty, I had know Idea an AR platform would hold groups like that. What scope are you using?
My loads for my Rifles have always centered around power with reasonable accuracy. The Sako Finnbear 30-06 can do 1/2" with the load I have for it now but it kicks you like a 300 Win Mag. Lapua Brass fire formed necksized, CCI BR2 Primers, 60.5 grains of H-205 Powder behind a Nosler 165 gr. Accubond or Balistic Tip depending on what I will hunt with it. It Chronos at 3100 fps + or - depending on temp.