When Norma is the "economy" brass, you know it's expensive!!!
Another option for long range is the 30-378 Weatherby. Brass is about the same price, but bullets are a tad cheaper.
Honestly though, do you expect to routinely shoot at targets more than 1/2 a mile away using a rifle with pounding recoil or a deafening muzzle brake?
I'd get a .308 and learn the trajectory with a given load and a LOT of practice ammo.