In a face to face private deal I would expect and even up trade. The 22 caliber revolvers are in very high demand right now because they are so cheap to shoot and perfect for training.

Trade it in at a dealer and the most you can expect is about 60% of the retail price. Assuming a retail value of 700 bucks, that means the dealer will offer 420 tops. About the only exception would be if you have a dealer that you've worked with for years who has a customer who has offered a premium for a good clean model 17. In that case he may offer near full value because he knows he can turn it quickly and feels that building "good will" is an important aspect of his business.