Yup, if you have access to a bead blaster that works great.
I've used sandpaper roll attached to a small polishing lathe to good effect on rusted barrels. I'll finish it off with some steal wool attached to a dowel and a power drill. A cheap Flex-hone replacement that hasn't harmed the Nellie I use.
I know of people who've used Easy Off and other cleaning products to remove the exterior coating. Just beware, as over application pits the surface badly! I wouldn't recommend this technique at all.