What is the estimated value of a Remington 760 Gamemaster 308 rifle?

Assuming that the rifle is in good condition, their is a market of collectors who would be interested in this rifle. If you are unable to determine condition of the rifle take the rifle in to a reputable dealer for an apprasial. Expect retail valuation of this rifle to be between $300 and $500. This is largely dependent upon the existing condition and if several buyers are interested in the rifle.