Is this the Benet cup or a different setup? Cartridge cases found near Fort Buford, North Dakota, included Benet cup, bar anvil, and swedged primer pockets, before the earlier center fire primers we know today (which resembled a shotgun primer). A few decades back, I found all those varieties in .45-70, likely fired from trapdoor Springfield rifles near the fort. Aside from a couple of different varieties of rifle bullets, and pistol bullets, Krag-Jorgenson bullets (identifiable by the iron jacket) were also found, and more rarely, a round ball or grapeshot ball.