I'm probably odd man out here. I built a custom 7 mag quite a few years back to be my "do-it-all" gun. It made up into a nice rifle that I had great hopes for. What I found was that the 7 was louder than the .30/06, kicked harder, and used a fair amount more powder to get not that much greater velocity. I ended up selling the 7mm mag, and can't say that I have been handicapped for doing so. It is a good round, just not my cup of tea as much as I wanted it to be.
