180 I think is the heaviest offering in a factory load. So I would look for the Accubond, Barnes, SST, or Remington probably offers the Scirrocco. You might be able to find heavier through Cor-Bon, HSM, and Gunwerks, but no guarantee's there. Double Tap has a 200grn Accubond that would work really well. That would extend your range to 800-900 yards depending on how comfortable you are with your rifle, and if it likes the ammo. The 185 Berger offering from HSM would be a good 1000yd whitetail bullet. But some guns like it, others do not. You'll just have to find something that works. The 180grn Accubond offerings will get you to 800 no problem. Personally I think the Vortex is a good pick. If you want custom turrets, they can make them for you.