Yes.
Ruger's web site has extensive sn data.
Not currently cataloged.
100-1000 USD depending on specifics
If the ruger site comes back up, you can check there sn database
100-440 or so
1/10
100-450
If sales falter, yes.
Go to Ruger's web site. They have sn data you can look up.
The Ruger website, under customer service, historical data, rifle, M77, will have the serial number ranges for each year of production.
100-400 or so