RE: Reloading .284 7MM Bullet
Chris...Welcome to the game. It's a lot of fun. What I'd recommend you do is refer to your reloading manual ( I feel Lyman is really tops ) for a powder recommendation in relation to the bullet you want to shoot
I load for the .280 Rem., the 7mm Mag, and the 7mm-08.....all .284 bullet diameters, as is your .284. MOST of my luck has been with IMR 4350 at mid-range to max loadings. This does not say that other powders may not be as good or better, it's just what I find shoots well in my guns. A lot of it is trial and error experience.
I'll bet others will chime in here and try to give you a hand too.
Anyway, good luck with this, and above all...be safe !!!