As re values for NM #3's, here's what mine sold for during the liquidation of my collection over the three years ending about a year ago.
#3 Target, .32-44, $2235
#3 Target, .38-44, $2025
#3 with target sights, .44 Russian, $6470
#3 Target, .38-40, $6500
Condition: All very good, some better than others. The 38-44 was outstanding if you could get past the considerable flaking on the cylinder. The .44 Russian was the best of the lot (the Duffy gun (poorly) pictured in N&J). The 38-40 was second best.
I don't know how these were sold, seems like the .44 Russian was sold by RIA. Best guess is the others were sold one on one. Pretty sure none were sold on Gun Broker, which was the vehicle for the regular everyday stuff.
Ralph Tremaine