What is your Hy Score pellet gun model 806 worth?

Let my examine your question. I think you mean Pellet rifle not Pellet gun. The Hy Score model 806 is the same model as the Winchester 422 and the Diana model 22. Unfortunately you did not give me any information about the condition of the rifle itself. Is it in {POOR, FAIR, GOOD, VERY GOOD or ExcelLENT Condition. You have to give me some sort of rating before I can give you an estimate of value. Tell me about the condition of the rifle. Does it still shoot?