The advantage for a 150gr is it usually works great in a 308. Its the wieght its the most effiecient. With the case capacity, you can almost match 150gr 30-06 velocities. But thats the extent of it. When you start moving past 165gr, the 30-06 will pass it up in a hurry, due to its case being able to handle the slower powders. With my 308Win, I can get 2950fps with 150gr Nosler BT and 47gr of Varget. Only problem is it usually is compressed.

I mean think about it, you can shoot a bullet 20gr heavier almost as flat as a 270Win shooting 130gr.