I wouldn't hesitate hunting deer with my 30. carbine..as I have done so many times. What really matters most, is how good of a shot are you with it? With open sites and a 75 yard shot in the neck sitting still is no problem.
What it may lack in knock down power at a long distance shot, challenges the Hunter to be at the top of his game in terms of skill with his rifle..and that should be something that we all strive for.