Hello Cap'n-Great old outfit! Thank you for showing it around. It's great to see the new work that is being done, but it's the old ones that warm the heart. You're fortunate that it still has some things left in it. Most times someone has taken them out, if anything was left.
As it happens I have a small cap flask that came out of the Washington Court House area of Ohio. I didn't recognize what it was until your post. Thank you for showing the way.
It always just looked like a small priming horn except that it resembles yours very closely. It doesn't have a powder odor in it either, it's more acrid. Someday, I'll post it.
All the best-Dick