It may not be perfect combo but I like the AR15 platform and think the round does well, at least in my rifle.
20" Krieger 1:9 barrel
Maxim bolt
Mega receivers
I have been doing testing on the factory Hornady 123gr SST. 2540fps av.
I took these videos through my spotting scope. I shot first at 500. Hit steel on th first shot. Then I shot two rounds at the clay, first off the right edge, 2nd shot dead on. Second video I go from 500 to 750, listen to the scope dial for proof of first round hit. Then first round on a 12" plate. I then tried to shoot the little tennis ball to the right of the steel. I couldn't quite get the wind figured out, but I have the elevation figured out on that particular round.
I have had a lot of fun with it so far. I will be putting some 123gr AMAX loads together soon to test. I understand them to have a better BC than the SST even though Hornady lists them as the same.
ETA: for a little more info.