This is just a guess because I don't know anything about you or your familiarity with firearms. Is the gun new to you, or have you had it and used it for a long time? Do you shoot revolvers more often than auto-loaders or auto-loaders more often than revolvers?

I ask those questions because many times when people are used to auto-loaders and then start shooting a revolver, they will end up short stroking the trigger (not letting it reset fully) and it will result in a situation like you described.

If the revolver is excessively dirty, or if the gap between the forcing cone and cylinder is too narrow, that area can become gummed up and/or fouled so badly that it inhibits the cylinder from turning.

If it's neither of those things, I'd recommend a gunsmith. It could be that the hand has been damaged or a number of other things.

Good luck. Hope that helps.

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This topic reminds me of similar ones posted in the past year where DW users have experienced a tightening of the cylinder/barrel gap when firing their revolvers. This is my theory, and the physics go something like this. In most other brands of revolvers the barrel is tightened in the frame to extreme tensions (even to the point of crushing a constriction in the forcing cone) to avoid any turning of the barrel during the firing sequence. When the bullet reaches enough pressure to separate from the cartridge case it is moving forward in a perfectly straight path; then it hits the rifling in the forcing cone. Imagine for a moment what would happen if the barrel was totally loose. The bullet would hit the right hand twist barrel and turn the barrel to the left thereby tightening the barrel into the frame. However, since the barrel is not able to move because it is tight, the rifling will force the bullet into a rotational spin in the opposite direction of the initial torque. Dan Wesson revolvers are unique (almost) in that they attempt to balance these forces by tensioning the barrel at both ends. The problem occurs when the barrel nut is torqued to the point that it will not allow that balance to occur. DW revolvers don't have the luxury of having the frame of the revolver as a solid stopping point because the shroud is not part of the barrel. So, even though the bullet is forced into a right hand twisting rotation, the initial left torquing starts to accumulate. Eventually, the barrel will gradually become tighter in the frame and reduce the cylinder/barrel gap. The correct (hand tighten only) tension on the barrel nut allows the barrel to torque both ways and everything stays put. With virtually no distortion of the bullet which normally occurs in the constricted forcing cones on conventional revolvers, the DW revolvers exhibit their renowned accuracy. 

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