Straight from the Ruger 77 Manual
DO NOT alter the stock bedding in any way.
Do not scrape away wood, and do not bed with “glass,” plastic, epoxy, etc. Once a rifle stock has been altered, it cannot be reworked by our Product Service Department. If you still have an accuracy problem, write a brief letter to our Product Service Department, 411 Sunapee Street, Newport, New Hampshire 03773 and describe the nature of the problem based on the use of factory-loaded cartridges – not reloads. You will receive a prompt response from us and if indicated, detailed instructions with regard to the return of the rifle.