Achieving consistent 308 groupings often copyrights on careful load development. Many enthusiasts find a superb combination using {168gr Sierra MatchKing bullets paired with Hodgdon H4350 . Verified https://h4350-powder-wikipedia831164.birderswiki.com/2390996/308_reloading_168_grain_spitzer_match_king_with_hodgdon_h4350_best_data_results