Been running 223 for a couple years in Tac division. The whole I've ran 77tmk. The rifle shoots awesome but it's so hard for spotters to see hits on a plate past 700 and really hard for me to spot misses because they just don't kick up much dirt so I'm switching to 308. I know years ago 175 smk was basically THE bullet to run but not sure if that's still the case. I know hornady makes a 176 Atip but not sure I want to spend that much on bullets curious if there's any others that will perform well. The BC on the Barnes match burners looks good but I haven't heard much about them and the little I haven't wasn't great reviews.