I'd echo the loads using 140/142s and H4831 SC, I've already burned up one 6.5-284 barrel with these loads and am now working on another and it's worked great.
FWIW, I've shot Nosler 120 BTs to 3,500 in my 6.5-300 Wby with very good accuracy and have killed two deer with them at 300 yards. I'd guess terminal velocity was 2800 or so at 300. One was double-lunged through the ribs, the other was shot through the bones of both shoulders. Both bullets exited at 1-1/2" or more. I shot another one on the point of the near shoulder quartering on at about 120, got no exit and massive internal destruction. Terminal velocity was probably around 3,200.
The beatings will continue until morale improves.