well - the .308 is actually pretty easy to load for. Some of the most commonly used powders include Win 748, IMR 4064 and 4895, Hodgdon Varget, 4895, & BL-C(2), and Alliant Reloader 15. Any of these work well in a semi-auto action and work well with bolts too, with just a little heavier load.

All my .308s are semis And I' ve had excellent results using 42.5gr of the 4895s with 165gr bullets and also 45.5gr of Reloader 15 with 150gr FMJs.
BTW - these loads use heavy, military-spec cases (LC or IMI) - for equivalent results with lighter Commercial brass, you will have to add up to 2gr more powder.

Good Luck