Your best resource is a local gun store or sporting goods store.
Since 1964.
You can request a owner's manual at the Ruger website.
50-160
A call to Ruger will get you the answer.
the most popular .22 long rifle today is the ruger 10/22
Long action.
If Ruger's website is up, they have extensive sn data on it.
75-170 USD
50-200
$100-$250, depending on condition
Ruger will tell you over the phone. If you can access the Ruger webiste, the data you want is also there.
Ruger has a sn search function on their web site.