I am pretty familiar with the 270win. I personally shoot speer 130btsp's on top of 57.5 grs imr 4831 in one gun and 58grs in the others. they all shoot well. I have taken deer, elk, bears, coyotes.....pretty much everything with that load and never shot twice. the beauty of the 270win is that EVERY BULLET MADE was designed to work at the 270wins velocity, so fancy bullets are not needed. of the 3 bullets I remember recovering all were perfect mushrooms and had decent weight retention.
I am by no means saying that the tsx's and partitions are not good, but they are not necessary in the 270win. 270wsm or roy and it is a whole new ball of wax, but since the win is the anemic one of the 277's you can get by with less bullet.
my $.02