Can't really help you with the particular bullet or powder. I've been using WC846 ,its mil. pull down powder , a little dirty , but I use it in 308,30'06 & 223 with great results in all those cal.. It is hard to give a load on it ,because all that pull down stuff is diff. lot by lot & what may be good for one lot may not be good for the next. I've been using it because I have so much of it & its about twenty years old, like most of my reloading equipment & even most of my primers (do have some new now ,been running low). WC 846 is hard to come by now , but do see it from time to time & I will pick up more when I get the chance. You don't say much about your AR 308, what bbl., trigger, what mags you using ?