While the 270 Winchester is good for deer. I would prouble say the 270 WSM or the 300 Wsm would bring down a elk, or caribou. Know, I'm no expert, but the 270 wsm with a 130 grain bullet will do just fine on most big game, but you will need some thing larger for animals like moose or grizzly bear. I would say you would need a 338 win mag for a moose or grizzly bear.