I agree with both HuntingGry and Rob/PA, it is easier to tell bowhunting (or really at closer ranges), but there are still times where it is difficult.

But my problems have been at lone deer while rifle hunting, having to make a quick shot at dusk, etc. You may be asking well then don't shoot. That would be fine with me except that we have been trying to thin out the doe herd, forcing us to be proactive in shooting does. In the future if I have any doubt I just won't shoot.