If you read Sierra's recommendations, they state the Gameking is their bullet designed for long range hunting. It is softer to get good expansion once velocity drops at distance. The Pro Hunter is recommended for use at closer ranges.
What TATELAW said.
Use the 130 pro hunter or the 140 HPBT gameking; it has a thicker jacket for closer ranges than the traditional game kings. I have used the 140 HPBT gameking in a 270WSM with good results at <100 yards.
Quoting the Sierra website:
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.
