I havent.. I wish I could! I have an 11 twist.. funny you mention rockys.. cause I just ordered some and I am going to try the 300gr. (even they might not stabilize in my 11 twist) but I am going to try them. i can use them in my edge is they don't run in the snipetac. But with the 325gr you will need a 1-9....1-9.5
When my barrel goes out instead of having it set back I am going to swap out for a 1-9.
your thinking right.. i have put a lot of time into calculations and the 338 sniptetac with the 325 rocky is the mac daddy... probably run it at 3350fps.. thats on the upper end.. for accuracy and case life still OK. even if the BC isn't as high as they claim.. call it i.e: .980 instead of 1.037... its still a awesome load combo... over 8,000lbs muzzle energy and capable of 3000 yard shots..
who is building your 338/408?