The 338 Federal may or may not be a commercial success but it is still kind of a neat cartridge and a lot more practical than the collection of short fats Winchester came up with.
Cartridges based on the 308 have always turned out to be good performers and useful cartridges.
The 308 is itself an often underappreciated cartridge. All the others are essentially a repackaging of older cartridge performance in a more modern, compact form. So, the 260 is a modern 6.5x55. The 7mm-08 is the 7x57. The 358 is a modern 348. The 338 Federal is a modern, juiced up, 33 Winchester.
I ordered reamers for the 7mm-08 and the 260 as soon as they were announced. Just because I thought they were pretty neat cartridges. The 338 Federal is another one. GD