It depends on the condition and the style of the gun. The 1500 came in two different styles stocks, one with a raised cheek piece and another without, along with a few other minor differences. The 300 win mag has become a popular caliber again and helps the value. If you have a the deluxe version stock in great condition I would expect your gun is worth between $350-500 pre-scope.
Side note. I bought a Smith and Wesson 1500 300 win mag about 8 years ago for $400 in great shape with a Bushnell 3x9 included.
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