Been doing some tactical prone matches and long distance shooting for a while, but im new to NRA high power,never done it before) and want to set up an AR15 platform correctly,I do believe in the "buy once cry once" mentality. I want to set up a "match rifle". I was considering going 6mmAR, but Im skittish about buying a round that HAS to be reloaded. Also, how well does plain ol .223 do in matches? it seems I can go this route and save a substantial amount on the completed upper. Any good threads I should look at for sights?