john123456.... as Flash explains, the transfer bar in your revolver may be pinched between hammer and frame.
To test for pinch:
1) Unload.
2) Cock.
3) Dry fire, holding trigger to rear.
4) Press hammer against frame with offhand thumb.
5) Slowly release trigger. If interference present, you should feel drag. If interference is great enough, pinch will prevent trigger reset until you release pressure on trigger.
Transfer bar broke on my Silhouette Super during a steel shooting match, inopportune timing, as I was out to set a record. Handed the transfer bar in two pieces to Bill Ruger, Jr., who promptly took a new SBH out of the box and clamped it in the dry fire machine. Cycled it over 100,000 dry fires without noticeable effect.
In all the years of working the New Model Blackhawk and SBH, I've yet to break another transfer bar.
Bill Ruger's transfer bar is the only fire control that puts a single action on par with the passive safety of S&W and Ruger double actions. Meaning, a New Model Ruger is the only single action I carry hammer-down on a loaded chamber.
A new revolver should be checked for pinch. Correct if necessary.
David Bradshaw