In my very limited personal experience, I've had much better fortune with the 30s than the 7s. It's to the point where I probably won't ever own a 7 again. Most likely it was my shooting or maybe my bullet choices. I only know that the 30s haven't given me any problems at all. I think perhaps I'm jinxed on the 7s and so I have no faith in them.
Here's an article on bear hunting that I enjoy reading pretty often.
