[fred cook]

.50 Navy rolling block pistol. It is an inside primed round with the telltell crimps just above the rim. The case is a balloon head style so it is easy to mistake one of these for a rimfire. The US Navy bought a couple thousand of the Remington rolling block pistols, some in 1865 and some in 1867. There was also an Army version of this pistol that used a slightly different round, also 50 caliber.