I am in the process of building my personal 338-300 ultra rouge. 37 degree shoulder and .012 body taper. I am using a 1 in 10, twist 32" Broughton 5C 7.97 contour with 8 flutes. I will be using a Lawton 7500 receiver in a McMillan A-4
or A-5. I am anxious to get this running. I have the barrel and have fluted it and I have the reamers, one for chambering the barrel and one .003 under for making a full length sizing die. I am waiting on a 7000 Lawton receiver and when I receive it I will make the decision weather I will go with the 7500 or a trued up Remington 700 with a custom bolt. As far as muzzle velocity I am hoping for 3000+ FPS. with the 300 SMK's. I will be offering 2-die sets with all chambering in this cartridge. I will be using Nosler brass which I am very impressed with and is still more economical than the 338 Lapua route, plus you still have the option of Remington brass. I am hoping to finish my project late sring 2007 and will be sure to post results.
I do not see a huge advantage over the 338edge,if any. I just wanted to go a little different route.