@ 1980
Depends on exactly what model you are talking about
100-500 usd or so
100-500
According to the latest edition of the Gun Digest $766.00 for a blued redhawk with a 5.5" barrel. You might go to a gun shop and ask them though and get a more current answer.
How old and how much?
Redhawk .41 Magnum pistols were first manufactured in 1979.
500-1000
In the condition you have described your Ruger No.1 will range in price from 675-900 dollars.
450 is a normal price in good shape
100-1000 USD depending on specifics
As long as both the rifle and the revolver are chambered in .44 magnum you can use the same ammunition for both. I have a Henry rifle in .44 mag and a Ruger redhawk .44 mag and I use the same ammo for both. That's one of the nice things about that caliber.