Miller
The Swarovski with the bt is good for 700 with my 7mm rm in a 140 or 150 nbt.
All you do is simply zero scope for 300. Then dial and drop a ring for 400, 500, and 600. The 700 is a few clicks past that. The good thing about the swaro is you can change loads or bullets without buying new turret. I really liked that over the zeiss or Leupy