I've been in several elk camps where hunters used .270 Winchesters, either with 130 grains or 150 grains bullets, both factory and reloads. They killed elk without any problems. I know a number of hunters here in Idaho who use it resulting in great benefit to their freezers. They use the same bullets as above.
The only problem with the .270 Winchester is that it is not a .280 Remington, like mine.
L.W.
