Potential problem with Winchester Model 37A shotgun


I pick up a used Model 37A 410 shotgun. I have not tried to fire any 410 shells out of it yet but I did chamber a once fired (out of rifle) 303 british case with spent primer still intact. It closed on the 303 case just fine and extracted/ejected just fine. The problem was I could not pull the hammer back with the 303 case in the chamber. With no case in the chamber the hammer will pull back, although it is a heavy pull. I am hoping to try and fire some 410 shells out of it next weekend but if I have the same results where the hammer can't be pulled back with a shell chambered, what might the problem be?

Edit: I wanted to add that with the action broke open the hammer will allow full cocking and repeat that with action closed on empty chamber the hammer will allow full cocking. It is only when a 303 brass case was inserted in the chamber and the action closed that the hammer would not move back to cocking position.
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