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The problem, as mykeal stated, is a too short arbor. The best way to check with an Uberti is to measure the thickness of two #6 washers and then drop them in the arbor hole and reassemble the gun, no wedge, and measure the gap between the frame and the barrel lug with dial calipers or feeler guage. The difference between the gap and the thickness of the two washers is how much the arbor is short. You can then make a plug to correct.
On their percussion guns Uberti uses a tapered arbor fitting into a tapered hole to try to limit barrel travel, and it works after a fashion unless someone uses too much force on the wedge and ruins the nice fit. Then you need to address the arbor bottoming out in the arbor hole. The barrel, under ideal conditons, should go on no further than the point where the barrel lug meets the frame.
With the wedge. You want it to go through untill at least the radius on the end clears the far side. More is OK less is not.
We have been having a good discussion on arbor and wedge fit over on the high road forum that gives a lot more details. Check it out.
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