It might have the wrong sights on it. T/C makes 3 different rear sights and 6 fronts. Call T/C with the info you posted and talk to one of their gunsmiths, they will send you a sight to cure the problem for free. I have had to do that once myself.
On a sidenote, I have a used 357 barrel that I bought a while back that I could not sight in. Checked the sights and the previous owner has the wrong rear sight and front sight on the gun. Luckly on that one I had an extra from a scoped gun that cured the problem. I just wish that everyone understood the different sight heights so when that take a scope off a barrel and put the sights back on to sell that they would not just grab some out of the pile.