There is quite a bit of argument whether any "exploding bullets" were used by the
CSA. The
CSA people continually denied it but there were several times where it was found.
To make matters even more complictaed there is question to the exact meaning of "exploding bullet." Glass bullets, powder filled w/ a percussion cap (for detonating cassions. There are at least three examples I have read of troops at Vicksburg passing messages between the lines that glass bullets wouldn't be used.
I've been told, but haven't seen this, there is supposedly also concrete evidence of their use at Gettysburg.
To add further to the confusion the horrific wounds caused by the standard minie ball were enough to confuse anyone and the experts of the day didn't have the knowledge of wound paths, ballistics etc.
My own belief is that they were never used in battle, frankly the thought of putting a percussion cap next to powder jostling in a cartridge box on my hip... would scare the hell out of me. However, I do firmly believe "glass bullets" were used.
I recall reading of an incident where a captured Drummer boy was nearly hanged because he had a bunch of what some men thought were glass bullets in his haversack. An Iowa Corporal pointed out that he was a drummer boy without a rifle and the bullets looked like marbles to the Corporal plus there was no powder... the drummer boy survived the war.
"Explosive bullets" as described by Fuller (I may have the wrong author as I'm on the road away from my references.) were a standard Minie Ball w/ a hollow cavity filled w/ powder, a percusion cap in the point of the bullet ignited the small charge. The idea was to use this to ignite Cassions. This was not a new weapon system. Both the Brits & French had been using them for at least twenty years.
"Glass Bullets" included a variety of examples, the majority seem to have been round balls; not minie balls. They were packaged as in standard cartridges. There was some question if these may have been a field expedient... I don't honestly know, but a glass bullet would shatter into shards in the wound and be VERY difficult for a surgeon to remove.
The argument has been covered quite in depth by one particular author; though I cannot recall who. I believe it may have been Claude Fuller but may be wrong.