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.
Depends on exactly what model you are talking about
100-500 usd or so
200-500 USD depending on condition.
100-500
Yes.
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.
$400-$575, depending on condition.
t 50-600 USD
Depends on who did the engraving, and if the pistol has ever been fired
Ruger's web site has sn data.
1970
About $400