I had a chance to do a quick load work up on my PSA freedom midlength. I can start my own post, but felt the accuracy potential of these uppers was relevant to this thread.
55gr vmax, h335 powder, Pmc brass, cci magnum primers, 2.250 coal. I loaded 10 rounds of 23.8, 24.0, 24.2, 24.4, & 24.6grains. Non free floated off bipod with no rear rest. Scope was a 3.5-10 vortex viper on 10x.
50 yards 5 shot groups. 50 yards is our local range's max.....
My best group was @ 23.8 and was also my last group. The barrel was really hot as I was in a hurry to finish up.
Theoretically this upper is capable of 1 moa @ 100 with 55grain vmaxes. Heavier bullets should yield even better results. A better shooter would also help this test.