I'm the archaeologist at Redstone Arsenal in Huntsville, Alabama and recently surveyed the battlefield of the 1864 Affair at Indian Creek Ford. Among a broad scatter of Civil War artifacts, I recovered a curious .44 caliber rimfire casing. The casing measures about 0.865 inches long. The rim diameter is 0.511 inches, and the rim thickness is 0.068 inches. It has no headstamp, and the curious thing about it is that it has two firing pin impressions exactly opposite eachother. I have never seen a casing like this, and I haven't heard of a double rimfire pin. It could have been misfired, reloaded, and struck again, but the pin impressions are in a perfectly straight line exactly opposite one-another. My initial impression was that it was a .44 Henry, but it seems a little short for that. Any ideas?