HM3. I have an article in either RIFLE or HANDLOADER magazine on proper full power loads in the 8x57. Like the 7x57, the 8mm is underloaded here in the U.S. Just to be sure, the 8x57 JS is the one with the .323 in bore right? If so, E-mail me and I'll try to find it. I don't give load data on a forum.