Have you reloaded a .284?
I had my first go round with it last month. It sucks compared to 3006 brass. IMO.
I would go for the 338 personally. I like extra air in the barrel, not metal.
I've been handloading 284 Win since 1977 for several different rifles, including a Savage Model 99F. The only trouble I ever encountered was with one box of Nosler Partitions. Didn't group worth a damn. Nosler Solid Bases (the old red boxes) work great though.
