As part of the practice work on deploying the tripod or what ever you choose as quickly, quietly and with the least amount of motion possible. Don't just leave it set up and shoot over it like a bench rest, re-deploy each shot.
If the 30 Nosler has to have the brake then yes to the 308 like the others have mentioned. In Namibia the 243 and the 308 were the two most popular cartridges with the professional game cullers, now it might be the 6.5 Creedmoor. In the thornbush country a 200 yard shot is a fairly long one, rarely will a 300 yard shot be required. Most shots are in the 75-150 yard range. More open country like in the Kalihari or Karoo the shots will be longer but usually not extreme.
