I've used a bolt wrapped in electrical tape to remove bullets before. Obviously electrical tape is not the end all for protection, but done properly, the tape will do a good job keeping the bolt centered and thus keep the tape intact.
One could probably do similar with a 1/4 drive socket that is undersized for the bore and again wrapped in electrical tape, as it would be more likely to remain square on the bullet nose.
Apparently it is somewhat common to use a primed case (not a blank, and not a loaded round!) with 1/3-1/2 of the normal powder charge to expel a stuck bullet. You can find it in Hatcher's Notebook, and you'll find others online who have done it. I've never tried it, and I'd certainly be leery of doing so, but it would be a lot quicker than other methods.