Everyone is different becuase of the ball flight, launch angle and spin rates but if you were hitting a 3-iron say 250 off a tee I'd exepct you to be able to hit your driver about 320.

But as I said, there are a number of factors that will influence the difference. Clearly the TM irons suit you better than your driver does. I'd suggest you go to a club fitter with a launch monitor system for a driver fitting.