I have seen this rifle shot with 600gr Barnes Originals, and that was memorable. crazy.
I would likely have a 1lb Merc-Decelerator installed. I also believe that a 500gr at 2100 would work as desired. I would probaly try to get my hands on some Rhino's if possible also.

AF
Let your work be shown to your servants, and your glorious power to their children.