A scope that will let you realize the full potential of that caliber will cost $1500-$2500. Factory ammo is out of the question unless you own oil wells. Reloading components will cost enough to make you cry.
If you're going to spend that much money on rifle, optics and ammo, just bite the bullet and get a Barrett or an Accuracy International.
If you want a 1500 meter rifle, you'll have to pay for a 1500 meter rifle.
When you go home, tell them of us and say:
"For your tomorrow, we gave our today."