Terry,
Second thoughts on this rusting......
Do you have any idea what may have caused the rusting? Did you use military surplus ammo with corrosive primers? After you've get the rust out, you may want to think on this long and hard to figure what caused this.
If you have a storage issue with dampness, I would suggest inspecting all your firearms thoroughly now, and if you find rust anywhere else you'd better get after it with a vengeance! I use 4-ought (0000)steel wool and gun oil to rub the rust away. Were you storing your gun in a soft case? Was it in a closet or locker without proper air movement and something to absorb moisture? Finally, I would recommend that you use a good coating of vasoline petroleum jelly in the bore and wiped over the exposed steel for storage.
Jim