Back off your sizing die a full turn. Start turning down the die a 1/32 of a turn, then size a case. Check chamber fit. Keep doing this until you can close the action easily and there is no light a the top of the action. If there is a lot of head space, you may need to start with more than one turn, but in most cases that is not needed. When you find the ideal sizing length, lock down the die and test the sizing again to ensure you are sizing correctly for your action. Once you have adjusted your die this way, you will be doing no more sizing that is needed to close the action. You can use this method on any break open action gun, Rossi, and T/C included.
Good Luck and Good Shooting