Two very successful powders for the .308 Win. are Hodgdon's Varget and IMR 4064. We are also getting great accuracy with Ramshot TAC but not sure if it is readily available. 45 gr. of Varget sends most 168 gr. bullets into one hole if the rifle is decent. Another tip you could consider, we have standardized on one overall length - 2.830" and it works in every rifle so far. I have an HS rifle in the Varmint model, it is a great shooter and will put five inside 0.5" if I can do my part. Good luck with your loading and shooting.