I have a couple 223's, a 16" contender and a 24" Cooper. They have both shown similar preferences for powders. H4895 and Benchmark have always been standouts for Velocity and accuracy. Other good powders have been H4198, H322, X-Terminator
Lately though I have been using TAC, I have found it to give great accuracy and even a little more velocity than Benchmark. But I have found that it definitely prefers CCI 450 primers, I was not real impressed with the accuracy of it until I tried the mag primers, now it is my go to powder for 223, flows great through a powder measure, clean burning, temp stable. Economical- about 3 dollars a pound cheaper around here.