W748 is a very good med burn powder that works great in AR gas guns. I also got excellent 308 bolt gun precision as well. The issue with 748 is its temp sensitive, so dont expect the same precision from a load developed in June vs attempting to shoot the same load in October. Ive documented all my ambient temps / charge adjustments so i know how the powder behaves but 748 will be fussy for a beginner looking to shoot year round.