ruger m77 varmint 220 swift

I have a chance to buy a older Ruger M77 varmint in 220 swift. The serial is 78 68---, which i believe was made around 1984. it has a checkered walnut stock, tang safety and a bushnell Banner 6x18 scope. The condition of the gun is near mint. What questions should I be asking and what type of accuracy can I expect. The price is $450