Did you take internal parts out and put them back in? Sounds like the bolt isn't riding on the hammer cam properly so isn't dropping into the frame properly. When you get to the next nipple, the bolt is falling into the cylinder stop and locking up the cylinder. Don't rotate it too much like that because if that is the case, the bolt will be scratching the bluing on the cylinder while you rotate it. Take the parts out again and put them back in paying close attention to the bolt, and how it's supposed to cam down when pulling the hammer to half cock. I think you just reassembled it wrong.
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