If you don't want to lose money on used guns (without waiting on inflation to "repay you") don't ever pay more than 3/4 of current retail price of that make and model . This is if it's in excellent condition, and if it's a popular caliber and model. Try real hard to get it for 1/2 of current retail. That's the guideline that FFLS have used for decades, and they are able to sell guns better than you can! Many of them can do their own smithing, too. If the finish is worn or pitted, grips are chipped or cracked, muzzle or sights are dinged, screw slots buggered up, etc, the price comes way down. DA revolvers, especially the "carry" type, get dropped a lot,, so look at it really closely for signs of a bent crane, bent cylinder pin, bent barrel, or damaged muzzle crown. $350 is all I'd go on that Chief, after checking it over carefully, and that's if I knew who was going to buy it from me the same week, at a $50 profit. If I had to risk buying it sight unseen, $250.