Just for interest a 28g Manufacture Liégeoise d'armes à Feu clearly intended for the U.S. market, with Cockerill fluid steel barrels.
Load markings were used only 1897-1903; for 28 grs = 2 Dram "Schultze" (the stylized lion over SCH) and 3/4 oz. shot. 65mm chambers.

[Linked Image from photos.smugmug.com]