About $250-$375, depending on exact configuation, marking and condition.
Request a manual from Ruger on their web site.
If you are seeking date of manufacture, contact Ruger through their website. Values depend on condition- anywhere from $100-300.
100-400 USD
75-150 or so
Ruger's website lists MSRP
Contact ruger and request a owner's manual
No such model. There was a SP101; 100-300
100-400 USD depending on specifics
50-225
A call to Ruger will get you the answer.
15 or 25 yards
100-350 or so