John I don't own one either, have never had to use one "knock on wood"! However I ran across an article some time back where a man threaded a 3/8 - 16 tap into the section of case that was stuck in the chamber then tapped the tap/case out by a rod inserted through the muzzle. I suppose any thread pitch would work as long as the OD is 3/8".
The tap is not large enough to go through the case and damage the chamber, however due to the tapered nature the tap doesn't need to go very far to grip the case sufficiently.