As you probably know, most rifles in the Civil war era were muzzle loaders, requiring the shooter to load powder and bullet from the "business" end of their rifle and force the round into the firing chamber via a ram rod. Well, sometimes they experienced a "dud", and faced the deliema of a loaded rifle and no way to extract the round. This was commonly caused by bad powder that would not ignite or "dirty" ignition system that failed because of powder fouling, a disadvantage caused by using black powder. To cure the problem, the soldiers would attached a "worm screw" to the end of their ram rod, run the ram rod down the barrel and literaly screw the "worm screw" into the soft lead bullet and "pull" it back out thru the end of the barrel. The weapon would need a through cleaning before firing again. It is not uncommon to find these "pulled" rounds in areas of intense finding, so get back out there and show us some more finds. "Pulled" bullets are certainly collector items and tell a story of desperation in combat. Hope this helps. Txquest