Woods,
Some older version Dan Wessons came cam with a "power control" option (a ring of holes round the barrel about 1/2" from the muzzle. Through this system, lead fouling would built up between the barrel and the shroud and among other things make removal of the barrel impossible, or close to it. As long as your gun does not have a "power control" barrel installed, i know of no reasons to exclude cast bullets.
Roll Tide