That type fuse sometimes had a percussion fuse screwed in the center hole making it a combination fuse. It sounds like the percussion fuse part was removed. No matter...
Hawesm: Welcome to the forum and thank you for approaching us. I wish everyone who stumbles across one of these interesting pieces of history would type in a few keystrokes to Google before acting rashly.
If this shell has not exploded in 140+ years, it is not going to blow up spontaneously. The gas can for the lawnmower in your garage is a much greater dangerous threat to you and humanity than this piece is.
So relax, have a Dr. Pepper, but do not call some well intentioned public servants because they will trot out all kinds of million dollar equipment to justify having wasted our tax money on locating said equipment in the US interior and to compensate for their 10 cent experience. Then they will drive a multi vehicle caravan off to some remote location where they will gleefully blow it up, in the process scaring the bejesus out of nearby residents who think the Apocalypse has arrived in the process and destroying the history of this fight that this and the arrowheads document. That's what they do, generally with no ifs ands or buts, and I suppose it is justifiable with more modern explosives, but these oldtime blackpowder ones are much simpler if only folks took the time to understand that.
You are a bit off the beaten path for most of the Civil War crowd, but I think with a little diligence someone who can safely take care of this for you can be found. Hang in there in the meantime and again thanks for the outreach.