Try inserting a .32-40. If it doesn't go in, you know you have something else.
From what I understand, chances of it being a Ballard .32-20, unless later rechambered, are pretty slim.
"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.