Just re-found a find I thought I lost in the field the day I found it...! A civil war bullet with a bullet puller imbedded in it. Apparently broke it off ramrod and had to shoot it out. It was close to a skermish line but will never know if it was during a fight or just camp maintenance...
That has entered my imagination a time or two! When I was a kid there was a movie that had a scene where a fellow shot another charging in with a ramrod. Can't remember movie, may have been the real life case. As far a rarity- This has to be up there with 2 bullets impacting each other, maybe more so...