So what our telling me is there is no differance between fed and win brass?
Other then the head stamp of course!
No, I have never said that there was no difference between the two, only that they were both made by Winchester. Like Barry noted, I made it pretty clear that it was made to Federal specs.
I actually like the Federal brass better than the Winchester brass, but have used both. I was using the Winchester first because I was actually working on the WSSM uppers before you could purchase brass from either Winchester or Federal. I was getting once fired brass from a guy from Winchester, and the dies that both Olympic Arms and I used in the early days came from a contact of mine at Redding. The Federal brass showed up late in the game by comparison.
Federal Cartridge is "right in my backyard" here in Minnesota, and has often been a great resource to me.
Leon, I have produced a couple of .338 WSSM's, but have not shot them over a chronograph. I used .338 Federal load data as a base-line, and loaded enough for feed/function tests, but didn't take them to the range. The rest of the wildcats on both sides of the .338 has exceeded it's short-action counterpart by 150-200 FPS, and I don't think there is any reason to think the .338 will as well.