I think the 3-inchers are relatively scarce and much sought after. Here's what I have for a track on the model:
Smith & Wesson 65 3 inch barrel. Revolver in .357 Mag. Blue Book of Gun Values (38th Edition) indicates between $450 in 98% condition with no value published for 100% condition for this gun. I have 37 recorded prices for guns represented as 95% or better using local and internet sources for this gun from $449 to $900 over a period of 1493 days ending October 27, 2017. The average price as of that date was $644. Current or last MSRP is $563. The last 13 prices I have for this model since 3/13/2016 range from $600 to $900 averaging $724.
I owned this 65-6 for a while: