100-1000 USD depending on specifics
Not currently cataloged.
Unknown caliber. Contact Ruger
Yes.
Ruger's web site has extensive sn data.
If the ruger site comes back up, you can check there sn database
100-400
400 USD or so
Go to Ruger's web site to find out.
Just bought a Ruger Mark II .257 Roberts paid $549.00
100-500 or so
100-500 usd
100-450