buckstix,
I dug the 8 bore cartridge out and the case was lathe turned, but it was not identified as to who did it. It seemed to have a large rifle primer, and it did have a lead conical bullet. The note taped to the side had the following written on it: 8 Bore, 260gr. 2F, 1140 gr. Lead Bullet, 1500 FPS. I have a sample of the bullet, and it measures .861". For whatever it is worth, I also have the shop made bullet mold that the bullets were cast in.
Mike