Let me ask you this: Did you draw the hammer back from the fired position? If the hammer is drawn back too far, the bolt will lock. Or if the hammer is lowered from the cocked position, the bolt will remain locked.
If you drw the hammer back slowly until you are at the loading notch, or half cock, the cylinder should be free to rotate.
As you draw the hammer back, the bolt releases to allow cylinder rotation, then past a certain point, will lock.
Bob Wright