You will need to reload as Id guess a 284 will be both expensive to feed factory ammo as well as being a fairly obscure round.
I know of a few 284s that have not lived up to their potential in a practical length. I do know of a 7mm-08 though that has been sending 162 Amax's at mid 2700 speeds with a 26" tube (accuracy was crap though). I think if you really want 280 performance you need a 280. Whats a few extra mm's of action length worth really?
You can always down load the 280 or WSM
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