I have never really taken a good look at the Ruger double from the double rifle perspective so I can not really comment on it. However I have looked at the H&K Lion Classic with a double rifle in mind and it would woork very well and is around $1000 less in price.
My wife and I are trying to put togther a African hunt for 2007, I hope to use my 450 for Buff then. I had high hopes of takeing a deer with it this fall but things did not work out that way and Barbara will not shoot it, she is such a wimp, so field results will have to wait for next saeson or for Africa.