Bearhuntr. The loads I listed came from the Hodgdon Manual NO.26. It lists loads with all powdwer IMR ALLIANT WIN and Hodgdon. Other manuals may vary as they always do from book to book. The difference between the 338 and 338-06 is like the difference between the 308 and 30-06 the smaller case is more efficient and produces less recoil with velocities pretty close to each other. At most hunting ranges the game would never know the difference. They are both good rounds. I don' t have either right now but given the choice between the two and the difference in performance I would take the 338-06 and the reduced recoil. My choice only. Shot placement is everything.