The distance you want to shoot,, that 165 gr. Sierra Game King will do everything you need it to do in a Rem. BDL 30/06. That said I would start with 55 grs. of IMR 4350 or H 4350 powder, work up from there and see where that takes you for accuracy. Don't rule out Reloader 17 or IMR 4451 powder for the 165 gr bullet. Good luck and watch for pressure signs when working up your load.
I use CCI BR2 Large Rifle primers or CCI 200 L.R. primers in my 06.
HelloI am new and want suggestions on best hunting loads for deer out to 400 yards. I prefer 165-180 grain. I know every gun is different and to trial and error but where would y'all start first?