Serveral FClass shooters I have talked with gave it a run for a while and it does get you a bump in velocity but not quite as consistent as H4895 or Varget so they switched back. Should do fine for heavies in 308
"Anyone taking up handloading necessarily plays with unknown factors and takes chances. But so does anyone who drives a car,goes to a cocktail party,eats in a restaurant,or gets married."
Jack O'Connor 1963