My perceptions of the Silvertips differ a little from most fellows. I worked a Fish and Game check station for a couple years way back when in the '60's...so heard lots of stories, same day they happened, and personally examined the carcasses. Keep in mind, this is steep timber country so shots are generally under 150 yards. Silvertips did very well in the 30-30's, very well in the 30-40's, moving up to the .300 Savage occasionally you would hear some complaints, same with the 'new' .308 but when you got up to the '06 and 150 gr bullet...I saw some spectacular surface wounds, and ruined meat...other than the fact the deer was dead, you could call it a bullet failure. The .270 was never very popular here for some reason, so I cannot comment. But my conclusion of the .30 cal Silvertips was as velocity went up, controlled expansion went down.
