Sierra would be my choice. Since 400 yards is your max, B.C. isn't king - I would also give Sierra's BTHP Gameking a look. They shoot really good in my rifles and are killers!!!
I've noticed the HPBT Game King has something of a following. Is there any difference in them beside the hollow point?
Sierra's description, which I have found to be true across several calibers for this design...
".270 CALIBER (.277) 140 GR. HPBT
The 140 grain #1835 Hollow Point Boat Tail bullet is intended for medium and heavier game at shorter ranges. It is a tough bullet, allowing higher impact velocities with good expansion at shorter ranges. It also delivers good long-range performance on heavier game from the 270 Winchester and magnum rifles in 270 caliber and is highly accurate."
https://www.sierrabullets.com/store/product.cfm/sn/1835/277-dia-140-gr-HPBT
