I don't understand the concept of running romex in conduit!! That 10/3 romex, will hardly fit in ½" and will still be tight in 3/4", even in 3/4" you won't get 10/3 around more than 1 90 degree bend. Save yourself a lot of headache and use single conductors in the conduit. If it is in the middle of the run splice in correctly sized boxes at each end.
