A little about me to begin. I have been hunting, shooting, and interested in all things shooting since I can remember. I am pretty knowledgeable about most aspects of shooting so am not asking for help identifying an old 30-30 Win.
Today my son found a real mystery cartridge that I have not been able to identify. It was found in an area settled in the mid-1800s and the patina on the cartridge places it anywhere up to the 1870s. It is a quite old centerfire with no head markings. Primer appears to be a copper boxer type with a quite large firing pin indent. It is a bottleneck, rimmed cartridge measuring 0.94”long, inside neck 0.420, base of 0.485, and rim of 0.515.
Any ideas? I have been through all the literature on obsolete cartridges I can find and none fit the bill.