As long as the 308 Win exists, the 338 Fed is dead as far as any market demand is concerned. Still a good round but dead in the water.
The same could be said for any new cartridge. There is at least one traditional cartridge covering every spot on the spectrum. And those traditional cartridges have stood the test of time for a reason and doing anything new is not really possible. Essentially every other new-ish cartridge is just a slightly different way to skin a cat. However, because the .308 isn't going anywhere I never have to worry about buying components for my 338 Fed. That, and the fact that it is Federal's first cartridge tells me it's not going away even if it's not a large part of the market.
