200-450 or so
100-1000 USD depending on specifics
500 USD or so
100-600 usd
You will have to define what you mean by "best". Is your primary objective recoil reduction, blast reduction, or a combination?
Depending on condition, anywhere from $450-$750.
100-450 or so
Manufactured in 1987. For specific month, you would need to contact Ruger. For another question about it to be answered, you would need to give a specific question.
300-500 USD
We can't tell without the serial number- but if you go to the Ruger website, under Customer Service, you can see the year of manufacture for serial numbers. You will need the spefic model of your rifle.
Ruger's website has sn data.
Strong enough for factory loaded ammunition and hand loads that don't exceed SAMMI standards.