Why not drill it out? If it's within an inch of the muzzle, use a 5/16" bit. Clamp the barrel in a vise between two pieces of wood, then take a center punch and indent the tip of the bullet, if its a FMJ or soft point. If a JHP, the bit should center itself. Keep the drill parallel to the barrel and drill through the bullet. Then, from the breech end, use a wooden dowel or brass rod as close to the bore diameter as possible, and use a hammer or dead-blow mallet to drive the bullet remains out through the muzzle.
When you continually slam on the back side of a stuck bullet and it doesn't immediately move, all you end up doing is compressing the lead, making it tighter in the bore. Drilling out the core of the bullet gives it somewhere else to compress, which is inward. You only have a small ring of lead and jacket to punch out of the barrel once the core is drilled out, but the rod you punch with has to be bigger than the hole you drilled. You might even start with a 1/4" bit. It goes without saying to keep the bit perfectly parallel and centered or you stand the chance of galling the barrel if you hit it with the bit.