Kroil mixed with a bit of Mineral Spirits and STP. Pour some in from the muzzle end (not a lot) and leave it to soak overnight, muzzle up. Put a container under it. Use a wooden dowel barely smaller than the bore and drive the bullet out from the breech/chamber end, not the muzzle, even if it's closer to the breech (unless it's very close to the breech). Why wood? Much less chance of deforming the base of the bullet. Most attempts to drive it out backward will result in deforming or cocking the bullet in such a way that you'll be visiting a Gunsmith next and who may also not be able to extract it. That, and once the tip of the bullet imbeds itself in the end of the dowel, it expands and you may both a bullet and a dowel wedged in the barrel you can't get back out. Remember that pounding on the pointy end means you are driving on the weakest end and, in the worse case you will bulge the sides creating more contact and seizing it worse. Tap, tap, tap, not whack, whack, whack with a BFH. Getting in a hurry means getting it good and stuck.