This late 1800s antique shotgun shell brass is in the hard to find

This late 1800s antique shotgun shell brass is in the hard to find 8 gauge size and was made by Union Metallic Co.

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My brother is an avid gunsmith and I just convinced him to start playing Red Dead. He sent me this picture this morning, he already owns the double barrel shotgun. : r/RedDeadOnline

If someone found shotgun shells in the 1870s, would they have been able to determine what model of shotgun was used? - Quora