So maybe I can help you out a little, I have a really nice private range where we train every week and shoot almost every weekend from spring to fall. We have about 8-9 different WOA 18" SPRs there between us. Every single one is a shooter. Our "standard" load for shooting steel is 24gr of TAC, 75BTHP Hornady or 77SMK in matching LC or Starline 556 brass. Every rifle is 3/4 moa or less. The SMKs are a little more accurate but a lot more money. I have ran this load to 1216 in Nevada and full size ipsc is pretty easy.
A GREAT shooting hunting load that I came up with that shoots great in all of them also is 53vmax, 24.7gr of Benchmark, Starline 556 brass.
We all run cci 450 primers in both loads.