I like the 140 grain bullet in the .270 Winchester. I purchased a thousand of the aluminum tipped 140 grain Sivertip, boattail bullets when they were discontinued. They have to be the finest old style Silvertip produced. On the scale every one that I have put it wieghts 140 grains. And they shoot 3/8's inch groups at 100 yards from a rest. They were produced at a high standard.
I have seen good results with other factory loaded Sivertips, from the 270, 30-30, 32 Special, 303 Savage, 300 Savage, and 30-06. Oops almost forgot the 30-40 Krag. Dad's buddy made a Texas Heart Shot with the 30-40 on a buck and the bullet exited up front.
I beleive the bullet was a 180 grain Silvertip. All my experience has been on deer.
Clearly the deer are afraid of them. I have never seen a buck when my rifle has been loaded with the 140 grain bullet.