Sorry I don't shoot factory ammo but one suggestion I will make with the 300WM, go with at least a 180gr bullet something like an Accubond or Interbond (if you truly think you will be shooting 500 yards) or a Partition. I like heavier but I don't know if you can buy factory ammo for it in the 200gr range.
With my magnums on elk I like 200gr +, 300wsm took a big cow 2 years ago with a 208gr A-max with one shot at 517 yards, the year before that I took a calf with my 338 win mag with a 225gr Interbond at 459 yards. I have used the 280 Remington and 30-06 a good bit as well with 160gr Partitions and 165gr Accubonds.
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