I have a “3-ringer” minie ball (.577 or .58 cal) that I suspect was Union found on the site of the Battle of Franklin, TN (1864). It might be CSA as it looks like there are side marks indicating it was a two-part bullet. On the top of the bullet is a hole that looks to be threaded. Very clearly there are rings of some sort inside this hole. Unfortunately one side inside the hole is a bit messed up making it difficult to determine for sure if these rings are spiraled like threads or not. My best guess as well as that of a few other people is that they are indeed threads. I have been trying to determine what these threads might be and the only thing I can come up with is the hole from a bullet puller. The problem is I don’t even know what a Civil War era bullet puller looked like. Would it produce a hole like this? Also to the best of any of y’alls knowledge was anything ever screwed onto the top of a minie ball, something similar to today’s grenade launcher? Some sort of an incendiary devise maybe? There is one other thing that makes this a little confusing. I will do my best to describe it. About one eighth of an inch from the top of the bullet is a “shoulder” of sorts. This “ledge” is very clearly a manufacturing mark as it is too precise to be anything else. It almost makes the bullet look like something was supposed to screw in to the top and rest on this collar. If the hole is from a puller I am at a complete loss as to what this extra ring is. Any and all help would be most appreciated.