I did a little ammo & tuner testing this morning. Three lots of ammo and three tuner settings. Shooting straight into an east wind of 3 - 5 mph. Just holding dead center and pulling the trigger. Two different lots of Federal Gold Medal Ultra Match and one lot of Eley. I think it would have been a lot better with no wind. Now I have to repeat the test on a really calm day.
Forgot to say the temp was 35 when I started and about 45 when I finished.