.50-45 Cartridge from Remington Rolling Block Carbine

[bluelake]

Here is from what I wrote in the artillery section:

I have been doing research on the 1871 U.S. military action in Korea for the past fifteen years. About ten years ago, I followed the U.S. "Line of March" on the island of Ganghwado for the first time; this past weekend, I did it again. I needed to collect evidence of the U.S. presence, as many of the spots along the LOM are being destroyed by development (one place where the U.S. had placed artillery now has a factory on it). To that end, I, along with three others (a Korean prof, another American and a Canadian) followed the LOM with metal detectors in hand. We found several items along the way, including brass from .50-45 Remington rolling block carbines and one dud.

In the officer's reports, here is what was written on the dud:

...I picked up from the field great numbers of copper-shell cartridges, unexploded, although the shell bore evidence of having been well struck by the firing pin.

(Capt. McLane Tilton, USMC)

I am told the primer used in this cartridge is a Benet. Is that correct?

Here is one of empty brass:

http://www.shinmiyangyo.org