Great caliber!! I can shoot core loct 165gr bullets under 1" out of my 280AI, IMO you should look at the BC of the bullets you will be buying. Try a few and see how they shoot, I have had good luck and it seams like whatever ammo I shoot in 280 out of my or my wifes rifle it flies great.
I reload for my Ackley and like the higher BC options and use the bergers but am planning on shooting my rifle further than 300 yards. I would try some of the fusion or cheaper stuff first and see how it shoots before dropping the money on HSM or Nosler custom ammo. Norma also makes some good looking ammo and if you ever decide to custom load you will have some good brass or if you want to get some of your money back I would buy all of the Norma brass from you
I'd give you $15 a box for the fired brass which would make Norma substantially cheaper than the HSM or Nosler!!!
Where at in Oregon do you live and where will you be hunting?