Actually, however, most bullets of American manufacture are so good that they almost always do their job pretty well and on a surprising variety of game. One fall, hunting in British Columbia, Arizona, and Sonora, I shot with the 130-grain Silvertip bullet of the .270 a moose, a grizzly, a caribou, a Stone ram, a desert ram, one whitetail deer, two mule deer, and one javelina. In all cases I considered the bullet action adequate.
Footnote: THE ART OF HUNTING BIG GAME by Jack OConnor, Outdoor Life, New York 1967
OConnor wrote about a number of bullets including Remington, Nosler, and Speer. He contributed to at least one of Speers reloading manuals.
You asked about the .270 Winchester. 130 grain Silvertips, and there is an opinion by a man who took far more game with the .270 Winchester then the average Joe. I started shooting the .270 Winchester in 1957. In all those years I have only used a couple of boxes of Silvertips. Now days I favor the 140 grain Hornaday or 150 grain in the .270. But my opinion is rapidly changing. A few years ago I bought a few hundred discontinued 140 BT Silvertips. They are a beautiful bullet, and consistently weigh 140 grains. They are also very accurate. I had not developed a load for these bullets until last fall. So I have yet to take a deer with one.