I have been using CFE223 in my .308 for hunting, I also use it in my 5.56 and my 30-30. I have found it to be a very good powder, a little temperature sensitive and the cases like to be pretty full. My loads vary depending upon the bullet. A hornady 155gr Amax gets 45. grains while a Nosler 125gr Ballistic Tip gets 52.5. I have taken deer around 300 yard with them with perfect shot placement and the deer drop immediately and do not suffer. Sorry I cannot help you with any longer ranges yet.