I am going to contact Hornady next week and see what information they can offer. They helped greatly when I started loading for the .375 ruger. I just got my Alaskan in .416 ruger last week and love it. It has a much better recoil pad than my African .375 ruger model. I cant wait to see the African model in the .416 ruger. I got my dies in and will be loading soon. I will keep you posted as to my results. Good hunting...