I bought a bushmaster ar-10 308 win a couple of weeks before all the madness started. I am looking for a basic load for it. I was going to load couple hundred rounds for it just to have on hand. I have no plans of shooting the rifle much. I don't want to waste alot of rounds load testing. It's got a 16" barrel with no idea of twist ( not on bm website?). I have a lot of spare 168gr smk's that I planed on using in it. I have varget and imr 4064 on hand. I shoot 4064 with 175's in my 5r lights out, but don't know a lot about gas operated 308's any ideas on a solid load?