If you plan on shooting both on the same day, shoot the maggies first unless you have a bronze brush with you to remove the fouling ring in the chamber from the special rounds. If you fire the magnums after without cleaning that ring out, the pressure from the case expanding can darn near weld that fouling to the chamber walls.

Also, the ring can cause pressure problems with magnum ammo that is fired while the rings is still in the chamber. Sometimes dangerous pressure spikes, since the brass can't expand and release the bullet from the case properly. Just some things to be aware of, but generally if you clean after the specials and before you use the maggies, you won't have any problems like everyone else has said.