From the sound of your comment, you mean it won't UNLOCK and allow you to cock the hammer for the next round? If that is the case, the locking bolt for the cylinder is out of time. It is either not relasing as soon as you begin to bring the hammer back or the hand is too long and trying to turn the cylinder before the bolt unlocks. Sounds more like a hand problem but either way it will take the services of a gunsmith or send the gun back to Ruger (my choice) to be corrected. Ruger will probably not charge you anything to do it except what it costs you to send it in. Be warned though, when they get the gun, they will put factory springs back into it before they send it back so you will have to redo your spring adjustments again. Good luck with it. 44 Man